The House Oversight Committee on Thursday expanded its investigation into former President Joe Biden‘s cognitive decline and the use of an autopen to authorize high-level executive actions, adding four more transcribed interviews with senior Biden aides to its schedule this fall.

The committee, chaired by Rep. James Comer (R-KY), has scheduled interviews with Ian Sams, Andrew Bates, Karine Jean-Pierre, and Jeff Zients, according to a committee aide. All four officials held top White House posts during the final months of the Biden presidency and were involved in either communications or policy implementation tied to clemency and other executive actions.