Former President Joe Biden's White House physician declined to answer questions before a House Committee as the GOP-led panel ramped up its investigation into Biden's age and health.

The House Oversight Committee has requested interviews with several of Biden's former White House aides in light of a reports questioning his mental fitness in his final year in office and alleged efforts by those around him to conceal it -- allegations Biden has vehemently denied.

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.