Another senior aide to former President Joe Biden is set to testify Thursday before the House Oversight Committee as part of the GOP-led panel’s investigation into what it charges was a “cover-up” of Biden’s mental decline.

The committee has said it is also investigating the “potentially unauthorized issuance of sweeping pardons and other executive actions.”

Ian Sams, who served as a special assistant to the president and senior adviser in the White House Counsel’s Office and later worked for Kamala Harris’ presidential campaign, is appearing voluntarily.

Several witnesses, including Biden’s White House physician , Dr. Kevin O’Connor, were subpoenaed and then invoked their Fifth Amendment right not to answer questions.

Other aides have fiercely defended Biden.

Anita Dunn, the former

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