Democrats demand Bolton testify in wake of 'explosive' details about Trump-Ukraine affair

The stakes over witness testimony at U.S. President Donald Trump's impeachment trial are rising now that a draft of a book from former national security adviser John Bolton appears to undercut a key defence argument.

Bolton writes in the forthcoming book that Trump told him that he wanted to withhold hundreds of millions of dollars in security aid from Ukraine until it helped him with politically charged investigations, including into Democratic rival Joe Biden.

Trump's legal team has repeatedly insisted that the president never tied the suspension of military assistance to the country to investigations that he wanted into Biden and his son.

The account immediately gave Democrats new fuel in their pursuit of sworn testimony from Bolton and other witnesses, a question expected to be taken up later this week by the Republican-led Senate. The trial resumes Monday at 1 p.m.with arguments from Trump's defence team.

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Pressure builds on Republicans to allow witnesses at Trump impeachment trial

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Sen. Mitt Romney, a Republican, says he thinks its important to hear from John Bolton after details of the former national security advisers manuscript emerged in the press.

The seven representatives prosecuting the case, known as House managers,called the Bolton revelations "explosive" in statement released Sunday.

"There can be no doubt now that Mr. Bolton directly contradicts the heart of the president's defence and therefore must be called as a witness at the impeachment trial of President Trump," the statementsaid.

• READ the full statement

Bolton's account was first reported by The New York Times and confirmed to The Associated Press by a person familiar with the manuscript on the condition of anonymity to discuss the book, The Room Where It Happened; A White House Memoir,ahead of its release March 17.

When the Times report went online Sunday night, the seven House Democratic managers immediately called on all senators to insist that Bolton be called as a witness and provide his notes and other relevant documents. Sen. Chuck Schumer, the Senate's top Democrat, issued the same call.

On Monday, some moderate Republican senators said they were open to the idea. For additional witness and documentary testimony to be allowed, 51 senators have to vote in favour, andDemocrats in the Senate number 47.

"It's increasingly likely that other Republicans will join those of us who think we should hear from John Bolton," Sen. Mitt Romney told ABC News.

WATCH | Sen. Mitt Romney, a Republican, says it's important to hear from John Bolton:

Bolton trying to sell book, Trump says

Trump denied the claims in a series of tweets early Monday.

Trump said people could look at transcripts of his call, and statements by Ukraine President Vlodymyr Zelenskythat there was no pressure for such investigations to get the aid.

Bolton, who acrimoniously left the White House a day before Trump ultimately released the Ukraine aid on Sept. 11, has already told lawmakers that he is willing to testify, despite the president's order barring aides from cooperating in the probe.

"Americans know that a fair trial must include both the documents and witnesses blocked by the president that starts with Mr. Bolton," the impeachment managers said in their statement.

Defence arguments resume Monday afternoon

First, though, Trump's legal team will begin laying out its case in depth, turning to several high-profile attorneys to argue against impeachment.

The lawyers revealed the broad outlines of their defence in a rare but truncated Saturday session, where they accused House Democrats of using the impeachment case to try to undo the results of the last presidential election and drive Trump from office.

The legal team is expected to pick up on that theme and also dive into areas that received negligible attention during the Democrats' presentation, including the now-concluded investigation into ties between Russia and Trump's 2016 campaign.

Trump's lawyers aren't expected to take as much time for their arguments as the Democrats, whose impeachment managers spoke for about 24 hours over three days. But they also don't need to: Acquittal is likely in a Senate where Republicans hold a 53-47 majority, with a two-thirds vote needed for conviction.

Still, they see an opportunity to counter the allegations, defend the powers of the presidency and prevent Trump from being weakened politically ahead of November's election.

Trump faces two articles of impeachment. One accuses him of abusing his power by asking Ukraine to investigate Joe Biden, his Democratic rival, at the same time that his administration withheld hundreds of millions of dollars from the country. The other alleges that Trump obstructed Congress by directing aides to not cooperate with the impeachment inquiry.

Dershowitzto focus on legal arguments

The legal team will portray Trump as having been harassed by investigations from federal agents and Democrats since he took office, and seize on the FBI's recent acknowledgment of surveillance errors during the Russia probe. The lawyers have already hinted that they will focus attention on Biden just as he campaigns for a first-place finish in next week's Iowa caucuses.

Monday's presentation is expected to include appearances by Alan Dershowitz, who will argue that impeachable offences require criminal-like conduct, and Ken Starr, the independent counsel in the Whitewater investigation that led to the impeachment of President Bill Clinton. Former Florida Attorney General Pam Bondi is also expected to make arguments.

Democrats argued their side of the impeachment case for three days last week, warning that Trump will persist in abusing his power and endangering American democracy unless Congress intervenes to remove him before the 2020 election.

On Saturday, the president's attorneys said there was no evidence that Trump made the military aid contingent on the country announcing an investigation into Biden. They also accused Democrats of omitting information that was favourable to Trump's case.