House Oversight Chair James Comer expands inquiry into Biden's fitness while in office

A Republican congressman is broadening an investigation into the extent of former President Joe Biden's physical and mental decline while in office, seeking testimony from some of Biden's closest advisers, including his first chief of staff. 

GOP Rep. James Comer of Kentucky, chairman of the House Oversight committee, sent letters to five of the former president's closest aides on Wednesday, requesting they answer questions about Biden's "mental and physical faculties" while he was leading the country. 

The aides include Biden's former chief of staff, Ron Klain, as well as members of his inner circle — advisers Michael Donilon, Bruce Reed, Steve Richetti, and Anita Dunn.