House Speaker Nancy Pelosi told a party meeting that she would also name the Democrats' team of "managers" who will lead the prosecution of Trump at the trial, Democratic congressman Henry Cuellar said.

The House impeached Trump last month on charges of abusing power by pressuring Ukraine to announce an investigation into his Democratic rival Joe Biden and of obstructing Congress.

But Pelosi has delayed sending the charges to the Senate in an unsuccessful effort to get that chamber's Republican Majority Leader Mitch McConnell to agree to include new witness testimony that could be damaging to the Republican president.

The Senate is expected to acquit Trump, as no Republicans have voiced support for ousting him, a step that would require a two-thirds majority.

Trump has denied any wrongdoing and has dismissed his impeachment as a partisan bid to undo his 2016 election win as he tries to win re-election in November.

A Wednesday vote would allow the Senate to start the trial on Thursday afternoon local time but lawmakers would likely not hear opening arguments until next week at the earliest.

"We'll have I think about a 10-minute debate and we'll vote on it and then send everything over. And the Senate trial, I assume, will start next week," Cuellar said.

Democrats want current and former White House officials such as former national security adviser John Bolton to testify, but McConnell has yet to say definitively how the Republican-controlled Senate will conduct the trial.

House Democrats have said Pelosi could name up to 10 lawmakers as managers to argue the case against Trump, including House Intelligence Committee Chairman Adam Schiff, who spearheaded the impeachment probe, and House Judiciary Committee Chairman Jerrold Nadler.

Australian Associated Press