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

President Donald Trump on Monday questioned the timeline of former President Joe Biden's recent cancer diagnosis, saying it was "dangerous" for the United States that the public was not informed sooner.

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.

Former President Joe Biden had a small nodule on his prostate, according to a spokesperson, that required further evaluation.