Joe Biden’s White House physician on Wednesday declined to answer questions during a closed-door deposition with the House Oversight Committee, invoking his Fifth Amendment right as the Republican-led panel pushes forward in its probe of the former president’s mental fitness and decline.

Dr. Kevin O’Connor also invoked his rights under the Fifth Amendment to avoid answering questions during a House Oversight Committee probe into whether Biden was capable of serving as president.

Former President Biden’s White House doctor, Kevin O’Connor, declined to answer questions during a deposition with the House Oversight and Government Reform Committee on Wednesday, according to a statement from his legal counsel,