House Speaker Nancy Pelosi of California, displays the signed article of impeachment against President Donald Trump in an engrossment ceremony before transmission to the Senate for...

US President Donald Trump holds up a newspaper during the 68th annual National Prayer Breakfast, at the Washington Hilton, in Washington.

Senate Majority Leader Mitch McConnell, R-Ky., gives a thumbs-up as he leaves the Senate chamber during the impeachment trial of US President Donald Trump at the Capitol in Washing...

Demonstrators protest outside of the Capitol during the Senate impeachment trial of US President Donald Trump in Washington.

In this image from video, a Senate page brings the first Democratic question to presiding officer Chief Justice of the United States John Roberts to be read during the impeachment ...

In this image from video, Senators vote on approving the rules for the impeachment trial against US President Donald Trump in the Senate at the U.S. Capitol in Washington. Senate r...

House Democratic impeachment managers, from left, House Intelligence Committee Chairman Adam Schiff, D-Calif., Judiciary Committee Chairman Jerrold Nadler, D-N.Y., Rep. Zoe Lofgren...

House Speaker Nancy Pelosi of Calif., signs the resolution to transmit the two articles of impeachment against US President Donald Trump to the Senate for trial on Capitol Hill in ...

House Sergeant at Arms Paul Irving and Clerk of the House Cheryl Johnson deliver the articles of impeachment against US President Donald Trump to Secretary of the Senate Julie Adam...

The pens that House Speaker Nancy Pelosi of Calif., will use to sign the resolution to transmit the two articles of impeachment against US President Donald Trump to the Senate for ...

Protesters demonstrate as the House of Representatives begins debate on the articles of impeachment against President Donald Trump at the U.S. Capitol building on Capitol Hill in W...

Protesters hold signs and sing in front of the White House in Washington.

The Capitol in Washington is seen as House Democrats prepare their impeachment case against US President Donald Trump charging him with abusing his high office by enlisting a forei...

Paul Brazie lights his protest sign with a flashlight as protesters hold up signs to traffic on Park Square in Pittsfield, Mass. supporting impeachment articles against US Presiden...

An anti-US President Donald Trump crowd gather at a rally to protest and call for his impeachment, in New York's Times Square.

An anti-President Trump crowd gather at a rally to protest and call for his impeachment in New York.

Doug, dressed as US President Donald Trump behind bars, joins a crowd gathered on Federal Plaza for a protest against the president on the eve of a scheduled vote by the US House o...

The Capitol is seen in Washington as Democratic leaders in the House are pushing ahead with formal impeachment charges.

Speaker of the House Nancy Pelosi, D-Calif., joined from left by House Judiciary Committee Chairman Jerrold Nadler, D-N.Y., House Financial Services Committee Chairwoman Maxine Wat...

Constitutional law experts, from left, Harvard Law School professor Noah Feldman, Stanford Law School professor Pamela Karlan, University of North Carolina Law School professor Mic...