WASHINGTON (AP) — Republicans on the House Oversight Committee issued a subpoena Thursday to Anthony Bernal, a senior aide to former first lady Jill Biden, as part of their rapidly expanding investigation into former President Joe Biden’s mental fitness while in office.

President Donald Trump’s White House has waived the protections of nine aides to former President Joe Biden ahead of their Congressional hearings on the former president’s fitness while he was in office,

Republican House Oversight and Government Reform Committee Chairman James Comer on Thursday issued a subpoena to a former Jill Biden aide in his panel's probe into Joe Biden's mental health.