After a stretch of limited public appearances since leaving office, former President Joe Biden’s cancer diagnosis arrived amid heightened scrutiny of his cognitive health.

Biden, even after he has exited political life and as he faces a serious cancer diagnosis, remains a factor in the conversation about his party's political future.

Ezekiel Emanuel, a prominent Democratic figure, told “Morning Joe” the former president "did not develop [prostate cancer] in the last 100 to 200 days."

One usual method would be to do a PSA test. Alternatively, he could have a new urine test that looks for genetic signals of cancer. Doctors could examine Mr. Biden’s prostate with an MRI, or ultrasound. “Ultimately, if they think this nodule is prostate cancer, the final step would be a biopsy,” Dr. Moul said.

The news that former President Joe Biden has been diagnosed with an "aggressive" form of prostate cancer has raised fresh questions about his White House's transparency. Biden's office said in a statement on Sunday that he was diagnosed with prostate cancer on Friday,