House Republicans have subpoenaed Anthony Bernal as part of their rapidly expanding investigation​ into former President Joe Biden's mental fitness​ while 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.

The subpoena signed by Rep. James Comer of Kentucky, the Republican Oversight chairman, requires Bernal to appear for a deposition on July 16. It came after several weeks of back-and-forth with Bernal's lawyer over the timing of a voluntary interview.