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Nancy Pelosi, Speaker for the House of Representatives, says they will be pushing ahead with introducing legislation to impeach Donald Trump.
"In protecting our Constitution and our Democracy, we will act with urgency, because this President represents an imminent threat to both," Pelosi wrote to House Democrats.
"As the days go by, the horror of the ongoing assault on our democracy perpetrated by this President is intensified and so is the immediate need for action."
Republicans are tipped to oppose the measure on multiple grounds, which would then force the legal challenge to the floor for a full vote.
Democratic leaders will also be asking for a unanimous consent on a separate resolution to get Mike Pence to convene the cabinet to invoke the 25th Amendment of the Constitution.
The hope there would be to get the VP and relevant politicians to 'declare the President incapable of executing the duties of his office'.
Vice President Mike Pence has 24 hours to respond to the resolution.
More than 200 House Democrats and one Republican have already come forward to indicate they will support the impeachment.
Republican Senator Pat Toomey of Pennsylvania said: "I think the President has disqualified himself from ever, certainly, serving in office again. I don't think he is electable in any way."
The articles of impeachment are expected to be submitted on Monday and a vote could come as early as Tuesday.
Ms Pelosi told 60 Minutes that she would prefer the 25th Amendment would be invoked rather than impeachment because it would remove Trump from office right away.
"There is a possibility that after all of this, there's no punishment, no consequence, and he could run again for president," the House Speaker said in a clip shared by CBS' Lesley Stahl.
"And that's one of the motivations that people have for advocating for impeachment."
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