(The Lion) — Former president Joe Biden’s physician Dr. Kevin O’Connor refused to answer questions about Biden’s alleged mental decline at a congressional hearing on Wednesday, further fueling suspicions of a cover-up.

“It’s now clear there was a conspiracy to cover up President Biden’s cognitive decline after Dr. Kevin O’Connor, Biden’s physician and family business associate, refused to answer any questions and chose to hide behind the fifth amendment,” said Oversight Committee chairman James Comer, R-Kentucky, according to the National Review.

“The American people demand transparency but Dr. O’Connor would rather conceal the truth. Dr. O’Connor took the fifth when asked if he was told to lie about President Biden’s health and whether he was fit to be President of the United States.”

O’Connor’s attorney David Schertler cited patient privacy and the Justice Department’s open investigation into Biden’s use of an autopen as the reason for invoking the Fifth Amendment, which protects against self-incrimination.