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Pelosi, addressing the press at the Capitol the day after Trump's supporters stormed the building, said that the President - due to leave office on 20 January - should be removed without delay, accusing him of a 'seditious act'.
She said: "Yesterday, the President of the United States incited an armed insurrection against America."
She added: "While it is only 13 days left, any day can be a horror show."
The 25th Amendment to the US Constitution allows for the vice president, along with a 'majority of either the principal officers of the executive departments or of such other body as Congress may by law provide' to declare the president 'unable to discharge the powers and duties' in a written declaration.
In this case, Pelosi called on Vice President Mike Pence, who would become acting president should Trump be forced from office.
Yesterday's violence saw four people die, including a woman who was shot and three more people who suffered from 'medical emergencies'.
President Trump has been accused of fanning the flames that led to the violence and uprising, and when called upon to disavow and placate those committing the acts, he asked for 'peace' but repeated the same baseless claims of electoral fraud that brought the issue to a head yesterday.
In a Twitter video, he said: "I know your pain, I know you're hurt, we had an election that was stolen from us, it was a landslide election and every knows it, especially the other side, but you have to go home now, we have to have peace.
"We have to have law and order, we have to respect our great people in law and order - we don't want anybody hurt.
"It's a very tough period of time, there's never been a time like this where such a thing happened where they could take it away from all of us, from me, from you, and from our country.
"This was a fraudulent election, but we can't play into the hands of these people.
"We have to have peace, so go home. We love you, you're very special. You've seen what happens, you've seen the way that others are treated that are so bad and so evil.
"I know how you feel, but go home, and go home in peace."
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