WASHINGTON — In the aftermath of last week’s deadly assault on the Capitol by supporters of President Donald Trump, members of Congress are expressing something once unthinkable: that some of their own colleagues may be endangering their lives. Not in a rhetorical sense, but in a direct and immediate way.

“It’s the most poisonous I’ve ever seen,” Rep. Don Beyer, D-Va., told NBC News in an interview. “There’s the overall sense that maybe if some of them have guns, and likely the ones who are more into conspiracy theories and QAnon with the pedophilic Satanic rings, are we safe from them?”

Since the deadly riot on January 6, lawmakers have suggested — not, so far, backed up by evidence — that far right colleagues may have helped plan or guide the attack itself. There are particular concerns about some newly-elected members who have espoused extremist views, including comments supportive of the QAnon libel that accuses perceived enemies of Trump of being part of a child abusing cult.

One House freshmen is pushing to carry firearms on Capitol grounds and another says they were armed with a gun during the attack, further putting their colleagues on edge. With Speaker Nancy Pelosi’s support, security officials have installed metal detectors outside the House floor, causing tension with some Republicans and effectively suggesting that members themselves may pose a danger.

Democrats are outraged at 147 Republicans who they argue abided by the rioters’ calls and voted to overturn election results even after the violent attack, which left five people dead and forced lawmakers to hide in their offices and safe rooms.

But, Beyer said, “the [issue] that has the greater emotional impact is the sense that there’s perhaps actual physical danger from our colleagues.”

With members traumatized, hundreds of members of the National Guard sleeping in congressional hallways, and warnings from authorities of continued threats, suspicion and rumor are running rampant.

Rep. Alexandria Ocasio-Cortez, D-N.Y., has said she feared for her life during the mob attack, in part because she doubted the motives of unnamed colleagues who were sheltering with her.

“There were QAnon and white supremacist sympathizers, and frankly white supremacist members of Congress, in that extraction point who I have felt would disclose my location and would create opportunities to allow me to be hurt, kidnapped, et cetera,” Ocasio-Cortez, a highly visible progressive and frequent target of conservative media, said in a speech Tuesday streamed live on Instagram.

Rep. Mikie Sherrill, D-N.J., has said she witnessed lawmakers holding tours around the Capitol the day before the attack that she believes may have been part of a “reconnaissance” effort for the rioters. There is no current evidence of such wrongdoing and Sherill has not publicly disclosed any names. But she and over 30 other Democrats have signed onto a letter asking authorities to investigate the claim.

“I was flat on the ground as other members were calling loved ones because they thought that might be the last phone call they made,” Sherrill said on “The Rachel Maddow Show” Wednesday. “To imagine that colleagues of mine could have aided and abetted this is incredibly offensive and there is simply no way they can be allowed to continue to serve in Congress.”

Raising the temperature further is the threat of Covid-19, with members continuing to contract the virus amid resistance among some Republican lawmakers to wearing masks.

Several members have tested positive for Covid-19 since the Capitol attack including Rep. Bonnie Watson Coleman, D-N.J., a 75-year old cancer survivor who blamed GOP colleagues for refusing to wear masks while sheltering in tight quarters during the attack. Other Democrats have made similar accusations.

“It’s very disturbing that [it’s] this combined threat,” Rep. Ann McLane Kuster, D-N.H. told NBC News. “The threat from within and the threat from without.”

A trio of GOP freshmen have drawn particular attention and concern from colleagues: Reps. Lauren Boebert, R-Colo., Madison Cawthorne, R-S.C., and Marjorie Taylor Greene, R-Ga.

Some lawmakers have suggested that Boebert, a Second Amendment advocate and past QAnon sympathizer may have deliberately revealed Speaker Nancy Pelosi’s location during the attack on Twitter. Boebert also tweeted “Today is 1776” the morning of the rally.

The concerns are not limited to Democrats. Rep. Nancy Mace, R-S.C., called Boebert “culpable” in the attack in an interview with National Journal, citing her tweet about Pelosi.

Boebert has denied any involvement in the assault, including claims she sought to draw attention to Pelosi’s whereabouts, saying her tweet came after the Speaker had moved on and did not mention her secure location. In a statement, she told NBC News she is “not a follower or believer of QAnon and I have repeatedly disavowed it.”

Boebert has also resisted new metal detectors amid her high-profile push to carry guns through the Capitol. Members are not allowed to have guns on the House floor.

The metal detectors have become a culture war flashpoint, with Boebert and other Republicans refusing to go through them at times. On Wednesday night, Pelosi announced she would impose fines of up to $10,000 on members who evade the metal detectors, writing in a statement that “it is tragic that this step is necessary, but the Chamber of the People’s House must and will be safe.”

Cawthorn, who spoke at a pro-Trump rally in Washington ahead of the Capitol siege, has said he was carrying a firearm during the riot.

“Congressman Cawthorn exercises his 2nd Amendment rights as well as privileges accorded to him as a member of Congress,” his spokesman, Micah Bock, told NBC News in an email. “Congressman Cawthorn seeks to abide by all known Capitol Police regulations.”

Cawthorn has also faced scrutiny for a call to “lightly threaten” lawmakers who did not support overturning election results, but a spokesman says he meant finding primary challengers for those lawmakers. In October, his campaign website accused a reporter of taking a job “to work for non-white males,” like Sen. Cory Booker, D-N.J., “who aims to ruin white males running for office.”

Cawthorn has denounced last week’s violence and denied any racist intentions in his comments. Bock said any member uncomfortable around Cawthorn “hadn’t met him yet” and would find him “friendly and amiable.”

Greene, for her part, has clashed with members over wearing masks, supported the president’s efforts to overturn the election, and explicitly promoted QAnon more than any national elected figure. She once described the Trump presidency as a “once-in-a-lifetime opportunity to take this global cabal of Satan-worshiping pedophiles out.”

Greene’s spokesman Nick Dyer denied suggestions she supports QAnon. He also said the allegation that she had endangered colleagues by not wearing a mask in a safe room during the attack was “ridiculous,” saying she had tested negative for COVID-19 two days before.

“She has nothing to do with QAnon,” Dyer said. “She doesn’t support it. She doesn’t follow it. She believes it’s disinformation.”

It’s hard to find historical precedent for this level of visceral worry about danger among lawmakers.

Joanne Freeman, a Yale historian and author of The Field of Blood: Violence in Congress and the Road to Civil War, likened it to the decades preceding that war in which fistfights repeatedly broke out on the House floor and one northern Senator was caned by a southern colleague.

Freeman cautioned against drawing too many direct parallels, as it was a more violent time in America across the board. But, she said, the violence in Congress both reflected and encouraged violence occurring outside its walls: It took place as slave owners were brutalizing Black Americans and engaged in limited warfare with abolitionists in the territories.

“Everything that happens in the Capitol and Congress has a symbolic representative nature and that’s some of what we saw this week and some of what we’re responding to,” Freeman said.

Two lawmakers, Colorado Democratic Rep. Jason Crow and Michigan Republican freshman Peter Meijer, both claim that some GOP colleagues voted to overturn the election results or against impeaching Trump out of fear their own family’s lives may be put in danger. Other Republicans have urged against impeachment in part to avoid inciting further violence, effectively conceding that pro-Trump extremists pose an ongoing threat.

Meijer said in an appearance on MSNBC that he and other members were purchasing body armor.

“It’s sad that we have to get to that point, but our expectation is that someone may try to kill us,” he said.

Kim Lane Scheppele, a professor at Princeton who studies how democracies slide into authoritarianism, said the atmosphere bore disturbing similarities to governments where dissident politicians live in fear of death threats, including fears that pro-regime extremists might target them with tacit support from government leaders or state security.

“In the atmosphere of threat, a lot of people quit,” she said. “By the time you’re at the endgame, you only have the people who say they refuse to be bullied and will risk their lives, and those that are so bullied they can’t even open their mouths.”

WASHINGTON — One day after the U.S. House of Representatives impeached outgoing President Donald Trump for inciting last week’s insurrection at the Capitol, a new NBC News poll finds that American voters are divided on his impeachment and removal from office, with most Republicans standing firmly behind the president.

Overall, 50 percent of voters nationwide say Trump should be impeached and removed from office, while 48 percent are opposed.

By party, 89 percent of Democratic voters believe Trump should be impeached and removed from office, compared with just 8 percent of Republican voters. Independents are split, with 45 percent in support and 53 percent in opposition.

The poll was conducted Jan. 10-13. While the House voted to impeach the president on Wednesday, the Senate will not take up the matter until Jan. 19, just one day before Trump’s term ends, meaning the trial will not be concluded while he is still in office.

President-elect Joe Biden is expected to lay out his $1.9 trillion relief package in a primetime address on Thursday — which will focus on a new round of stimulus checks to struggling Americans and an ambitious vaccine distribution plan to control the deadly pandemic.

Biden will ask the new Democratic-controlled Congress to approve the “American Rescue Plan.” A chunk of the funds —$416 billion— will help launch a national vaccination program with a goal of vaccinating 50 million Americans and reopening schools in the first 100 days of his administration.

His speech comes as the pandemic continues to worsen. According to NBC News’ Covid-19 data tracker, there have been 384,375 deaths and more than 23 million cases in the U.S.

The Trump administration has been heavily criticized for its distribution strategy for the vaccines. As of Wednesday, of the more than 29 million vaccine doses distributed nationwide, just over 10 million people have received their first dose, according to the Centers of Disease Control and Prevention.

Two senior transition officials told NBC News that the Trump administration has barely invested in building a federal infrastructure to help states distribute the vaccine.

An extra $1 trillion would be allotted to help struggling Americans with the third round of stimulus checks — giving them $1,400 direct payments, including an extra $400 per week for unemployed and affected workers. Biden is expected to also ask Congress to raise the minimum wage to $15 per hour in an effort to help frontline workers battling the pandemic.

Billions will also be allotted to help small businesses, low-income families facing homelessness, paid family leave affordable child care access, and improving access to federal nutrition programs for children and families.

Last month, $600 payments started being dispersed as part of the nearly $900 billion Covid-19 relief package that President Donald Trump signed into law after after delays during which he urged legislators to instead send out $2,000 checks. The Democratic-led House then passed a bill to greenlight the larger checks, but the legislation never received a vote in the Senate.

House Majority Speaker Nancy Pelosi, D-Calif., and incoming Senate Majority Leader Chuck Schumer, D-N.Y. expressed approval of the package in a joint statement Thursday ahead of Biden’s remarks.

“These proposals by the Biden-Harris administration will be critical to getting our country through this challenging period and towards a period of recovery. We echo the president-elect’s call for bipartisan action on his proposal and hope that our Republican colleagues will work with us to quickly enact it,” the Democratic leaders said.

Biden has signaled that he wants a Covid-19 relief bill on his desk by the end of January — a plan that may be complicated due to an impeachment trial that’s expected to take place in the Senate in the coming weeks.

“We are in a race against time. We need these resources to vaccinate the vast majority of Americans and to put safety measures in place that will help us put Covid behind us so that we can reopen our schools, businesses, and once again be able to get there with our friends and family,” one senior transition official said on a briefing call with reporters on Thursday before Biden’s address.