Republican Rep. James Comer is requesting former White House physician, Kevin O'Connor, appear for a transcribed interview as part of a probe into Biden's mental fitness.

President Donald Trump called for more answers regarding former President Joe Biden's prostate cancer diagnosis.

While House Republicans and Trump appear to be aligned in their desire to investigate Biden’s fitness to serve, there is some frustration brewing among congressional committees about how quickly the Trump administration is responding to some of their requests, according to multiple GOP congressional sources familiar with the matter.

The Republican-led House Oversight Committee on Thursday took its first step in its new investigation of the White House's handling of former President Biden's health: Demanding testimony from his doctor and his top advisors.

President Joe Biden revealed he was diagnosed with prostate cancer. His age and fitness for office were a central talking point. How old is Trump?

The GOP-led House Committee on Oversight and Government Reform has called on President Joe Biden's physician and former White House aides to sit for interviews as it investigates.

President Trump and his allies are trying to thread the needle as they take digs at former President Biden’s fitness for office in the wake of his prostate cancer diagnosis. Biden’s

A look at the times former White House press secretary Karine Jean-Pierre denied former President Joe Biden was in declining mental or physical health.