President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE said Tuesday that John Bolton John BoltonThe 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 Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE, his former national security adviser, would “know nothing about what we’re talking about” even if the former White House aide were to testify in the Senate impeachment trial.

Asked by reporters during a meeting with Greek Prime Minister Kyriakos Mitsotakis whether he would be comfortable with Bolton testifying, Trump responded, "That's going to be up to the lawyers. It'll be up to the Senate, and we'll see how they feel."

“He would know nothing about what we're talking about because, as you know, the Ukrainian government came out with a very strong statement, no pressure, no anything, and this from the boss,” Trump continued. “That's from the president of Ukraine. The foreign minister came out with a statement that was equally as strong.”

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Bolton, who left his White House post on testy terms with the president, said in a statement Monday that he would be willing to testify in a Senate impeachment trial of Trump if subpoenaed because the legal question of whether a senior adviser to the president can be subject to compelled congressional testimony would not be resolved until after the conclusion of a trial.

“I have had to resolve the serious competing issues as best I could, based on careful consideration and study. I have concluded that, if the Senate issues a subpoena for my testimony, I am prepared to testify,” Bolton said.

It appears unlikely, however, that the GOP-controlled Senate will call Bolton to testify.

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE (R-Ky.) announced Tuesday that he had the votes to pass an organizing resolution to begin the trial without requiring witness testimony. Democrats have pushed for the Senate to call Bolton and other White House officials to testify about the Trump administration's dealings with Ukraine.

Bolton is viewed as a key witness because he was privy to events leading up to and following Trump’s July 25 conversation with Ukrainian President Volodymyr Zelensky, during which the president asked Ukraine to investigate a debunked theory about 2016 election interference as well as former Vice President Joe Biden Joe BidenThe Memo: Warning signs flash for Trump on debates Senate Republicans signal openness to working with Biden National postal mail handlers union endorses Biden MORE and his son Hunter Biden’s business dealings in Ukraine.

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Bolton described the effort by administration officials to press Ukraine for the investigations as a “drug deal,” according to witness testimony in the House impeachment inquiry. His attorneys have also said he has relevant information on meetings and conversations regarding Ukraine.

The Democrat-controlled House voted almost strictly along party lines last month to impeach Trump for abusing his office by pressuring a foreign leader to launch politically motivated investigations and for obstructing the congressional inquiry into his dealings with Ukraine.

Trump has maintained he did nothing wrong on the phone call, describing it as “perfect” and insisting Democrats impeached him in order to damage him politically. As he did Tuesday, Trump has pointed to statements from Ukrainian officials saying they felt no pressure from him.

Bolton, who declined to testify before the House but was never subpoenaed, had previously said he would wait until a lawsuit by his former deputy Charles Kupperman was resolved. Kupperman had asked a court to decide whether he should obey a congressional subpoena for testimony or the White House instructions that he not testify, but a federal judge declared the case moot last month.