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.

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.

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.