WASHINGTON (AP) Republican leaders do not yet have the votes to block Democrats from summoning John Bolton or other witnesses at President Donald Trump s impeachment trial, Senate Majority Leader Mitch McConnell conceded to fellow GOP senators late Tuesday. It could be a major hurdle for Trumps hopes to end the trial with a quick acquittal.

McConnell gave the news to senators, according to a Republican familiar with a closed-door meeting of GOP senators and granted anonymity to discuss it.

McConnell convened the meeting shortly after Trumps legal team made its closing arguments in the trial.

Democrats are demanding several witnesses, especially Bolton, Trumps former national security adviser who writes in a forthcoming book that Trump told him he wanted to withhold military aid from Ukraine until it helped with investigations into Democratic rival Joe Biden . Thats the crux of one major article of impeachment against the president.

There are still several days before any potential witness vote would be taken. A decision to call more witnesses would require 51 votes to pass. With a 53-47 majority, Republicans can only afford to lose three.

The news came as Trumps legal team argued forcefully against the relevance of testimony from Bolton and concluded their defense as the Senate braced for debate on witnesses.

While scoffing at Boltons manuscript, Trump and the Republicans have strongly resisted summoning Bolton to testify in person about what he saw and heard as Trumps top national security adviser.

Senate Republicans spent two days behind closed doors discussing ideas to satisfy those who want to hear more testimony without prolonging the proceedings -or jeopardizing the presidents expected acquittal.

Those lost steam, and Democrats showed no interest.

Chuck Schumer, the Senates top Democrat, called a proposal for senators to be shown the manuscript in private, keeping Bolton out of public testimony, absurd.

Were not bargaining with them. We want four witnesses, and four sets of documents, then the truth will come out, Schumer said.

Senators are being warned that if they agree to call Bolton to testify or try to access his book manuscript, the White House will block him, beginning a weeks-long court battle over executive privilege and national security. That had seemed to leave the few senators, including Sen. Mitt Romney of Massachusetts, Susan Collins of Maine and Lisa Murkowski of Alaska, who have expressed a desire to hear new testimony without strong backing.

Also, other Republicans including Sen. Pat Toomey want reciprocity bring in Bolton or another Democratic witness in exchange for one from the GOP side. Some Republicans want to hear from Biden and his son, who was on the board of a Ukrainian gas company when his father was vice president.

A day after the defense team largely brushed past Bolton, attorney Jay Sekulow addressed the controversy head-on by dismissing his manuscript said to contradict a key defense argument about Trumps dealings with Ukraine as inadmissible.

It is not a game of leaks and unsourced manuscripts, Sekulow said.

The argument built on a separate one Monday night from Trump attorney Alan Dershowitz, who said that nothing in the manuscript even if true rises to the level of an impeachable offense. Sekulow also sought to undermine the credibility of Boltons book by noting that Attorney General William Barr has disputed comments attributed to him by Bolton.

The legal team also delved into areas that Democrats see as outside the scope of impeachment, chastising former FBI Director James Comey and seizing on surveillance errors the FBI has acknowledged making in its Russian election interference probe.

Trumps attorneys argued that the Founding Fathers took care to make sure that impeachment was narrowly defined, with offenses clearly enumerated.

The bar for impeachment cannot be set this low, Sekulow said. Danger. Danger. Danger. These articles must be rejected. The Constitution requires it. Justice demands it.

Before consideration of witnesses, the case now moves toward written questions, with senators on both sides getting 16 hours to pose queries. By late in the week, they are expected to hold a vote on whether or not to hear from any witnesses.

I dont know that the manuscript would make any difference in the outcome of the trial, said Roy Blunt of Missouri, a member of GOP leadership. And some Republicans said they simply dont trust Boltons word. Rand Paul of Kentucky called Bolton disgruntled and seeking to make money off his time at the White house.

John Kelly, Trumps former White House chief of staff, told an audience in Sarasota, Florida, that he believes Bolton.

White House officials privately acknowledge that they are essentially powerless to block the books publication, but could sue after the fact if they believe it violated the confidentiality agreement Bolton signed against disclosing classified information.

Trump is charged with abusing his presidential power by asking Ukraines leader to help investigate Biden at the same time his administration was withholding hundreds of millions of dollars in security aid. A second charge accuses Trump of obstructing Congress in its probe.

Trump and his lawyers have argued repeatedly that Democrats are using impeachment to try to undo the results of the last presidential election and drive Trump from office.

On Tuesday, as he was resting his case, Cipollone played video clips from House Democrats during the presidential impeachment of Bill Clinton including several who are now managers of the Trump impeachment trial in an attempt to depict them as hypocritical for sounding the alarm then about the partisan dangers of impeachment.

What they are asking you do is to throw out a successful president on the eve of an election, with no basis, and in violation of the Constitution, Cipollone said. Why not trust the American people with this decision? Why tear up their ballots?

Democrats, meanwhile, say Trumps refusal to allow administration officials to testify only reinforces that the White House is hiding evidence. The White House has had Boltons manuscript for about a month, according to a letter from Boltons attorney.

No matter the vote on witness, acquittal still seems likely given that Republicans hold a 53-47 majority in the Senate and conviction would require a two-thirds majority.

According to data compiled by C-SPAN, the House managers used just under 22 of their 24 hours over three days, while the White House team used almost 12 hours, or half their time.

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Associated Press writers Alan Fram, Mary Clare Jalonick, Andrew Taylor, Matthew Daly, Laurie Kellman and Padmananda Rama contributed to this report.