Senate Majority Leader Mitch McConnell of Ky., speaks with reporters after walking off the Senate floor, Thursday, Dec. 19, 2019, on Capitol Hill in Washington. (AP Photo/Patrick Semansky)

Senate Majority Leader Mitch McConnell of Ky., speaks with reporters after walking off the Senate floor, Thursday, Dec. 19, 2019, on Capitol Hill in Washington. (AP Photo/Patrick Semansky)

PALM BEACH, Fla. (AP) — Senate Majority Leader Mitch McConnell said Monday that he was not ruling out calling witnesses in President Donald Trump’s impeachment trial — but indicated he was in no hurry to seek new testimony either — as lawmakers remain at an impasse over the form of the trial by the GOP-controlled Senate.

The House voted Wednesday to impeach Trump, who became only the third president in U.S. history to be formally charged with “high crimes and misdemeanors.” But the Senate trial may be held up until lawmakers can agree on how to proceed. Minority Leader Chuck Schumer is demanding witnesses who refused to appear during House committee hearings, including acting White House chief of staff Mick Mulvaney, and former national security adviser John Bolton.

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McConnell, who has all-but-promised a swift acquittal of the president, has resisted making any guarantees, and has cautioned Trump against seeking the testimony of witnesses he desires for fear of elongating the trial. Instead, he appears to have secured Republican support for his plans to impose a framework drawn from the 1999 impeachment trial of President Bill Clinton.

“We haven’t ruled out witnesses,” McConnell said Monday in an interview with “Fox and Friends.” “We’ve said let’s handle this case just like we did with President Clinton. Fair is fair.”

That trial featured a 100-0 vote on arrangements that established two weeks of presentations and argument before a partisan tally in which Republicans, who held the majority, called a limited number of witnesses. But Democrats now would need Republican votes to secure witness testimony — and Republicans believe they have the votes to eventually block those requests.

In a letter Monday to all Senators, Schumer argued that the circumstances in the Trump trial are different from that of Clinton, who was impeached after a lengthy independent counsel investigation in which witnesses had already testified numerous times under oath. Schumer rejected the Clinton model, saying waiting until after the presentations to decide on witnesses would “foreclose the possibility of obtaining such evidence because it will be too late.”

Schumer also demanded that the Senate, in addition to receiving testimony, also compel the Trump administration to turn over documents and emails relevant to the case, including on the decision to withhold military assistance from Ukraine.

Schumer told The Associated Press on Monday that he stands ready to negotiate with McConnell, and that he hopes questions about witnesses can be settled “right at the beginning.” Without witnesses, he said, any trial would be “Kafkaesque.”

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“Let’s put it like this: If there are no documents and no witnesses, it will be very hard to come to an agreement,” Schumer said.

If McConnell won’t agree, “We can go to the floor and demand votes, and we will,” he added.

Schumer told AP the Democrats aren’t trying to delay the proceedings, saying the witnesses and the documents his party is asking for are directly relevant to the charges in the House impeachment articles.

Meanwhile, the White House is projecting confidence that it will prevail in a constitutional spat with Democrats. House Speaker Nancy Pelosi has delayed sending the articles of impeachment to the Senate in hopes of giving Schumer more leverage in talks with McConnell. But the White House believes Pelosi won’t be able to hold out much longer.

“She will yield. There’s no way she can hold this position,” Marc Short, the chief of staff to Vice President Mike Pence, told “Fox News Sunday.” “We think her case is going nowhere.”

And in another move, the White House announced an expanded role for Rob Blair, a senior adviser to Mulvaney and one of the four current and former officials Schumer has called to testify.

The White House announced Blair will serve as special representative for international telecommunications policy, in addition to his role advising Mulvaney, helping to implement next-generation telecommunications infrastructure, including 5G wireless technology.

The impasse between the Senate leaders leaves open the possibility of a protracted delay until the articles are delivered.

Trump has called the holdup “unfair” and claimed that Democrats were violating the Constitution, as the delay threatened to prolong the pain of impeachment and cast uncertainty on the timing of the vote Trump is set to claim as vindication.

“Pelosi gives us the most unfair trial in the history of the U.S. Congress, and now she is crying for fairness in the Senate, and breaking all rules while doing so,” Trump tweeted Monday from his private club in Palm Beach, Fla., where he is on a more than two-week holiday vacation. “She lost Congress once, she will do it again!”

Short called Pelosi’s delay unacceptable, saying she’s “trampling” Trump’s rights to “rush this through, and now we’re going to hold it up to demand a longer process in the Senate with more witnesses.”

“If her case is so air-tight ... why does she need more witnesses to make her case?” Short said.

White House officials have also taken to highlighting Democrats’ arguments that removing Trump was an “urgent” matter before the House impeachment vote, as they seek to put pressure on Pelosi to send the articles of impeachment to the Senate.

At one point, Trump had demanded the testimony of witnesses of his own, like Democrats Joe Biden and his son Hunter, and the intelligence community whistleblower whose summer complaint sparked the impeachment probe. But he has since relented after concerted lobbying by McConnell and other Senate Republicans who pushed him to accept the swift acquittal from the Senate and not to risk injecting uncertainty into the process by calling witnesses.

The Constitution requires a two-thirds majority in the Senate to convict in an impeachment trial — and Republicans have expressed confidence that they have more than enough votes to keep Trump in office.

A separate but related fight flared Monday in the courts, where the House Judiciary Committee held open the possibility of adding to the articles of impeachment against Trump depending on whatever testimony it can obtain from former White House counsel Don McGahn. The committee also said that testimony from McGahn could be useful in any impeachment trial in the Senate.

A federal appeals court is set to hear arguments on Jan. 3 on whether to force McGahn to comply with the subpoena.

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Associated Press writer Michael Balsamo in Hudson Falls, New York, AP Radio Correspondent Julie Walker in New York and AP writers Hope Yen and Eric Tucker in Washington contributed to this report.

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This story has been correct to say Republicans were in the majority, not minority, in the Senate during the Clinton impeachment trial.