John Bolton 'willing to defy the White House' and testify in impeachment inquiry: report
John Bolton appears on ABC (screen grab)

Former national security adviser John Bolton is reportedly "willing to defy" the Trump White House and serve as a witness in the House of Representatives' impeachment inquiry.

The Washington Post, citing "people familiar with [Bolton's] views," reports that the former Trump national security adviser is willing to testify in the impeachment probe as long as he is legally cleared to do so.

The Post's sources say that Bolton's testimony likely won't be helpful to the White House.

"Top State Department and national security officials have already testified that he was deeply concerned about efforts by Trump and his allies to push Ukraine to open investigations into the president’s political rivals while the Trump administration held up military aid to that country," the publication writes. "The former national security adviser, who abruptly left his post in September, is expected to confirm their statements and describe his conversations with Trump, according to the people, who spoke on the condition of anonymity because of the ongoing inquiry."

Bolton resigned in September, just after the still-anonymous whistleblower's complaint against the president was filed with the intelligence community inspector general, who deemed it a "credible and urgent" threat.

Former National Security Council member Fiona Hill has testified that Bolton was wary of Trump attorney Rudy Giuliani's efforts to press Ukraine to investigate former Vice President Joe Biden -- and she said he labeled Giuliani's campaign a "drug deal."