The Trump administration has denied executive privilege to the nine aides of former President Joe Biden slated to testify before the House Oversight Committee regarding the allegations that there was a cover-up of the former president’s “mental decline.”

The first witness, Neera Tanden, testified before the Oversight majority and minority counsel Tuesday, and was not protected by executive privilege per a letter sent by the White House Tuesday. Executive privilege allows the witness to withhold information from Congress to protect the integrity of the executive branch. The rest of the witnesses will also be denied the same protections as the investigation progresses.