The House Oversight Committee’s first closed-door, transcribed meeting investigating former President Joe Biden's mental acuity began Tuesday with former White House Domestic Policy Council Director Neera Tanden appearing for questioning on Capitol Hill.

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.