Hunter Biden attributes his father's poor debate performance to Ambien use and exhaustion as House Republicans expand investigation into the former president's cognitive abilities.

Kevin O'Connor, former President Joe Biden 's physician, is set to testify before the House Oversight Committee about Biden's health in office after President Donald Trump waived executive privilege for O'Connor, according to a letter obtained by Newsweek.

Joe Biden’s former doctor Kevin O’Connor refused to answer when asked about the former president’s health, invoking the Fifth Amendment during a congressional deposition. O’Connor is being accused of not being forthcoming with the public about Biden’s health during his presidency and covering up his cancer diagnosis.

President Biden’s debate performance Thursday put his apparent cognitive decline on full and dangerous display. The debate exposed a weakness in the White House that has become impossible to ignore.

Dr. Kevin O'Connor cited physician-patient privilege and the right against self-incrimination under the Fifth Amendment.

President Biden has not received a cognitive test, and he has no plans to pursue one. Why it matters: As concerns about the president's age and fitness threaten to plague his 2024 campaign, allies ...