Congress is ramping up its probe into who was really making decisions in the Biden White House as concerns over the former president’s mental decline take center stage.

The House Oversight Committee, led by Chairman James Comer, is expanding its investigation into an alleged cover-up of Biden’s cognitive state and the possibility that key executive actions, including pardons, were issued without his direct approval. The push comes as multiple former senior Biden White House officials have now agreed to testify under oath in the coming weeks.

Among those slated for transcribed interviews are Biden’s former Chief of Staff Ron Klain, senior advisors Steve Ricchetti, Mike Donilon, Bruce Reed, and communications advisor Anita Dunn. Their interviews are scheduled to take place from July 24 through August 7, according to committee sources.

Additionally, two other former officials, Ashley Williams and Annie Tomasini, will testify on July 11 and July 18, respectively. These testimonies are expected to shed light on who may have been making key decisions during Biden’s final months in office, as questions swirl about his capacity and who was really steering the ship.

Not everyone from the former administration is cooperating voluntarily. The committee has issued subpoenas to Dr. Kevin O’Connor, Biden’s physician, and Anthony Bernal, a senior advisor to the first lady. O’Connor’s deposition is set for July 9, while Bernal is scheduled for July 16.

Comer has made clear that the investigation seeks to determine whether senior White House staff stepped in to manage or conceal the president’s decline, effectively making decisions on behalf of the commander-in-chief without his full consent. If such a cover-up occurred, Comer warns, Congress may need to pursue legislative safeguards to prevent it from happening again.

The investigation gained further steam when Comer sent letters to former press secretary Karine Jean-Pierre, ex-chief of staff Jeff Zients, deputy press secretary Andrew Bates, and special assistant Ian Sams, demanding they appear for transcribed interviews. The committee is particularly interested in who was exercising executive authority during critical periods and how decisions were communicated to the public and to Congress.

“Americans deserve transparency about who was exercising presidential power while Biden was reportedly in decline,” Comer said in a statement. “If it is found that staff were executing key duties without his awareness, Congress must act to address this.”

The Oversight Committee has set deadlines for these top former officials to confirm their participation, warning that subpoenas will be issued if they refuse to testify voluntarily.

The probe into the Biden White House comes as President Trump and his allies continue to highlight questions about the former president’s capacity, using it as a flashpoint to contrast leadership ahead of the 2026 midterms and to underscore the stakes for voters concerned about who is truly in charge.

The investigation is expected to stretch through late summer into the fall, ensuring the Biden cognitive decline cover-up allegations remain in the spotlight as new testimony unfolds.

Stay tuned as the list of those called to testify grows—and the real story of who was calling the shots inside the West Wing begins to emerge.