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Former Biden adviser Mike Donilon testifies in House committee probe into Biden mental fitness

1:34
Hunter Biden suggests Ambien might be to blame for father's disastrous debate
Drew Angerer/Getty Images
BySarah Beth Hensley and Lauren Peller
July 31, 2025, 8:10 PM

Mike Donilon, former President Joe Biden's senior adviser, appeared for a closed-door interview on Thursday in the House Oversight Committee's probe into the former president's mental fitness while in office.

Donilon, one of Biden's oldest and closest advisers, spoke before the Republican-led committee's attorneys as its chairman, Republican Rep. James Comer, continues his investigation into Biden.

No members attended Donilon's interview on Thursday, which began shortly after 10 a.m. When it wrapped about six hours later, Donilon left without answering questions from reporters.

Senior Advisor to U.S. President Joe Biden Mike Donilon walks to Marine One on the South Lawn of the White House on July 21, 2021 in Washington, DC.
Drew Angerer/Getty Images

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Donilon was the latest in a line of former Biden officials who have been called before the committee to answer questions about the former president's mental capacity while he was in office. On Wednesday, Steve Ricchetti, who served as a counselor for Biden, answered questions.

Last week, former Chief of Staff Ron Klain cooperated with the committee for several hours.

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MORE: Former Biden counselor Steve Ricchetti testifies before GOP-led panel amid probe into Biden's mental fitness

However, several other aides have not been willing to engage with the committee and invoked the Fifth Amendment, including Dr. Kevin O'Connor, the former physician to Joe Biden, and Annie Tomasini, who served as the deputy chief of staff to Biden.

President Joe Biden holds news conference at the 2024 NATO Summit on July 11, 2024 in Washington, DC.
Kevin Dietsch/Getty Images

Biden himself rejected reports of cognitive decline during an appearance on ABC's "The View" in early May.

"They are wrong. There's nothing to sustain that," Biden said at the time.

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