Democrats said impeachment proceedings could begin as early as Monday -- an extraordinary acceleration of a process that historically has taken weeks, but one that might not be completed before President-elect Joe Biden is sworn into office on January 20.
House Speaker Nancy Pelosi warned that Democrats will launch the process unless Trump resigns or Vice President Mike Pence invokes the 25th Amendment, where the cabinet removes the president.
"He's deranged, unhinged, and dangerous. He must go," Pelosi, referring to Trump, tweeted on Friday.
The move to impeach came amid continued fury over the storming of the Capitol on Wednesday by angry Trump supporters, which left five people dead, including a Capitol policeman.
- 'Gravely endangered of US' -
The impeachment text being prepared by Democrats laid blame squarely at the president's feet.
"In all of this, President Trump gravely endangered the security of the United States and its institutions of government. He threatened the integrity of the democratic system, interfered with the peaceful transition of power, and imperiled a coordinate branch of government."
Trump, who had urged his supporters to come to Washington on Wednesday for a rally opposing his November election loss, has remained defiant, even after finally posting a video Thursday in which he belatedly promised an "orderly transition" to the Biden administration.
But the president also said that "it's only the beginning of our fight."
That sort of language prompted Twitter to suspend Trump permanently and fueled Democrats' moves against him.
The Twitter ban drew an angry response from Trump, who in a statement late Friday accused the popular platform -- where he had more than 88 million followers -- of having "coordinated with the Democrats and the Radical Left."
Twitter not only suspended the @realDonaldTrump account but took action against others, including @POTUS, when he briefly turned to them.
- Biden defers to Congress -
Several Democrats and at least one Republican lawmaker -- Senator Lisa Murkowski of Alaska -- have urged Trump to resign and avoid the messiness of impeachment proceedings in his final full week in power, but he reportedly has remained defiant in talks with his aides.
Trump has said he never intended for his supporters to attack the Capitol building -- where Congress had convened to certify Biden's victory in the state-by-state Electoral College tally -- but only meant to encourage peaceful protest.
But in the chaos that day, one Trump supporter was shot and killed, lawmakers, reporters, and staff were forced to take shelter, a Capitol policeman was killed in the chaos and invaders looted and vandalized the historic building, some parading through its halls with Confederate flags.
Just as when Trump was impeached in a traumatic 2019 partisan vote -- but not convicted -- the process requires first majority backing in the Democrat-controlled House of Representatives, and then, for conviction, two-thirds approval in the Senate.
Reaching two-thirds could be difficult in the narrowly divided upper chamber, but a number of Republicans who long supported Trump have expressed their disgust with the events of Wednesday.
Trump supporters including Senator Lindsey Graham have urged Biden to intervene with top Democratic lawmakers to call off the impeachment effort.
"I'm calling on President-elect Biden to pick up the phone to call Nancy Pelosi and the Squad to end the second impeachment," Graham said Friday on Fox News, referring to the House speaker and a group of four young progressive Democrats who are favorite targets of the political right.
But Biden -- whose inauguration on January 20, traditionally a pomp-filled event attended by thousands, is being seriously scaled back -- on Friday side-stepped a reporter's question about impeachment.
"What the Congress decides to do is for them to do," he said.
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