US Republicans in Congress are deeply divided after 10 members split with their party to impeach President Donald Trump on Wednesday.
Congresswoman Liz Cheney, the third-ranking House Republican, is facing calls to resign her party leadership role after she voted to impeach President Donald Trump.
The lawmakers who voted against Mr Trump face threats of violence, and have increased security, they say.
It comes as Mr Trump prepares to leave office and faces a trial in the Senate.
The House of Representatives voted by 232 votes to 197 on Wednesday to impeach him for allegedly inciting rioters who stormed the Capitol last week.
The FBI has warned of possible armed protests planned for Washington DC and all 50 US state capitals in the run-up to Democratic President-elect Joe Biden’s inauguration on Wednesday.
Ms Cheney, a Wyoming congresswoman whose father was vice-president to Republican George W Bush, faced immediate calls to resign after voting to impeach Mr Trump for inciting insurrection against the US government.
“I’m not going anywhere. This is a vote of conscience,” said Ms Cheney, after Mr Trump’s conservative defenders in Congress called for her to quit.
“It’s one where there are different views in our conference. But our nation is facing an unprecedented, since the Civil War, constitutional crisis,” she told reporters on Wednesday, as Trump was impeached for a historic second time.
Another Republican has said he and several colleagues have purchased body armour and have been forced to change their normal routines after receiving threats of violence.
“It’s sad that we have to get to that point, but you know our expectation is that someone may try to kill us,” Michigan Republican Peter Meijer told MSNBC on Thursday.
“We don’t know what’s going to happen next. We weren’t expecting for the Capitol to get overrun for the first time in 200 years,” he said.
“And so in this unprecedented environment with an unprecedented degree of fear, of divisiveness and hatred, we have to account for every scenario.”
The Senate – the upper house of the US Congress – will hold a trial to determine the president’s guilt but this will not happen during Mr Trump’s remaining week in office.
Republican Senate leader Mitch McConnell said there was “simply no chance that a fair or serious trial” could conclude in time given “the rules, procedures, and Senate precedents” that govern trials involving presidents.
A two-thirds majority will be needed to convict Mr Trump, meaning at least 17 Republicans would have to vote with Democrats in the evenly split, 100-seat chamber.
As many as 20 Republicans are open to convicting the president, the New York Times reported on Tuesday. In a note to colleagues, Mr McConnell said he had not made a final decision on how he would vote.
If Mr Trump is convicted, senators could then hold another vote to block him from running for elected office again, which he had indicated he planned to do in 2024.
The first impeachment of Mr Trump was in 2019 over his dealings with Ukraine. He was acquitted by the Senate.
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