John Bolton John BoltonDiplomacy with China is good for America The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures MORE and his publishing team are denying any claims that they leaked details of the former national security adviser's unpublished manuscript to The New York Times following a bombshell report in the newspaper Sunday night.

The Times first reported that Bolton's book will say President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE wanted to withhold nearly $400 million in U.S. aid to Ukraine until the country's president, Volodymyr Zelensky, committed to opening investigations, including into former Vice President Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE, a 2020 political rival.

The report came one day before the White House defense team was set to begin its second day of arguments fighting against the impeachment charges brought forward by House Democrats. The timing has led some Republicans to raise questions about the report.

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But Bolton and his team say "categorically" in a statement that did not work with the Times to publish such details.

"There was absolutely no coordination with the New York Times or anyone else regarding the appearance of information about his book, THE ROOM WHERE IT HAPPENED, at online booksellers," Bolton, Simon & Schuster, and Javelin Literary said in a joint statement.

"Any assertion to the contrary is unfounded speculation," they added.

And while Bolton's legal team has slammed the "corrupted" White House book review process after the details of the unpublished manuscript leaked, neither Bolton nor his representatives have denied the reports about what he has written.

Still, the Times report has sparked a wave of reactions on Capitol Hill, with Democrats stepping up their calls for witnesses to testify.

And some Republicans on Monday appeared increasingly open to the idea of hearing Bolton and other witnesses testify following news of the report.

Sen. Mitt Romney (R-Utah) recently said that “it’s very likely” he’ll vote for additional witnesses.

But it's unclear if Democrats will get the four Republican votes needed to call witnesses. Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (R-Ky.) and other Republicans have been against the idea, arguing that the House should've subpoenaed Bolton during their impeachment inquiry rather than wait until the Senate trial to pursue such evidence.

House Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies MORE (D-Calif.), the lead impeachment manager, has defended not subpoenaing Bolton, arguing that they would've still be fighting the former Trump official in the courts for his testimony if they had gone down that path.

Schiff on Monday told reporters that in order for the Senate to give a fair trial over Trump's contacts with Ukraine, they must be able to call Bolton and other witnesses to testify.