The US Senate’s top Democrat has called for current and former White House aides to testify at President Donald Trump’s expected impeachment trial.
Chuck Schumer said he wanted senior officials including White House acting Chief of Staff Mick Mulvaney and ex-adviser John Bolton to be summoned.
But the Republicans, who control the Senate, have called for a short trial without witnesses.
A vote in the House to impeach Mr Trump is expected on Wednesday.
If a majority votes for impeachment, the case will then move to a trial in the Republican-controlled Senate.
The president is accused of soliciting a foreign country to help him politically, by trying to pressure Ukraine to launch a corruption investigation into his Democratic rival Joe Biden.
Mr Trump is also accused of obstructing Congress. The White House refused to allow staff to testify during hearings in the House of Representatives in recent weeks.
The Republican president denies wrongdoing. He has called the Democratic-led inquiry a “witch hunt” and predicted it will even benefit him in next year’s presidential election.
Mr Trump lashed out on Sunday at the Democratic leader of the US House of Representatives, Speaker Nancy Pelosi, tweeting that “Nancy’s teeth were falling out of her mouth, and she didn’t have time to think!”
What did Schumer say?
Mr Schumer, a New York senator, made the appeal for witnesses in a letter to Senate majority leader Mitch McConnell on Sunday.
In addition to Mr Mulvaney and Mr Bolton – a former National Security Adviser – he also called for Robert Blair, a top aide to Mr Mulvaney, and budget official Michael Duffey to give testimony at the expected Senate trial.
“All four of these witnesses were asked to testify in the House impeachment inquiry but did not appear,” the letter says.
Mr Schumer said the trial must be one “that not only hears all the evidence and adjudicates the case fairly; it must also pass the fairness test with the American people”.
He referred to the “bipartisan spirit” of the 1999 impeachment trial of then-President Bill Clinton in which witnesses were called.
“It is clear that the Senate should hear testimony of witnesses at this trial as well,” he wrote, as he called for subpoenas to be issued for the four men.
Mr Schumer said he also wanted the Senate to issue subpoenas for a set of documents that Democrats believe “will shed additional light” on Mr Trump’s dealings with Ukraine.
He also laid out a timetable for the expected Senate trial, suggesting that pre-trial proceedings take place on 6 January and that senators and US Supreme Court Chief Justice John Roberts, who will preside over the case, be sworn in the next day. In total, he suggested as many as 126 hours of proceedings.