Looking for support
Democrats also want to hear from other administration officials, including acting Chief of Staff Mick Mulvaney.
Democrats would need only four GOP senators to side with them to call witnesses or present evidence. They've been focusing efforts on several GOP senators who are either facing tough re-election fights this year or have shown willingness to act independently in the past, including Maine's Collins, Alaska's Lisa Murkowski and Utah's Mitt Romney.
Trump was impeached on Dec. 18 for abuse of power and obstruction of Congress, and Democrats justified the relatively speedy investigation by arguing that Trump's continued actions threaten the 2020 election.
Only two other U.S. president have been impeached and tried in Senate -- Clinton and Andrew Johnson in 1868. Both were acquitted.
Trump on Sunday tweeted at "This Week" correspondent George Stephanopoulos minutes before he started his interview with Pelosi. "Ask why hearing was most unfair & biased in history?"
"I don't like to spend a lot of time on him," Pelosi said when asked about the tweet and Trump's regular characterization of her as "crazy." "Everything he says about someone else is a projection."
Pelosi said Trump continues to violate the Constitution. Asked if it was possible the House might file additional articles of impeachment, she said, "Well, let's just see what the Senate does.
--With assistance from Erik Wasson and Steven T. Dennis.
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