A top oncologist who once worked for former President Joe Biden claimed Monday that his old boss must have had prostate cancer long before Sunday’s public announcement of his diagnosis and suggested the oldest-ever president may even have had the disease for “a decade.

Former President Joe Biden has been ... outlines the timeline of medical decisions made in the White House. Presidents have a team of medical professionals taking care of their health.

Before his cancer diagnosis, Biden had been taking the train from Delaware to Washington, meeting with his post-presidential staff, allies and former Cabinet secretaries, accordin