Donald Trump has joined the growing clamor for Joe Biden‘s White House doctor to be investigated for giving the former president a clean bill of health months before he revealed he had an aggressive form of prostate cancer.

On May 18, former President Joe Biden’s staff announced he has an aggressive form of prostate cancer. In response, several social media users began circulating a three-year-old video clip of Biden as evidence that he knew about his diagnosis years before.

President Donald Trump strongly suggested that Joe Biden hid his prostate cancer diagnosis from the American people when opining on the news, adding that the alleged omission is worthy of investigation. “It’s a very, very sad situation. I feel very badly about it. And I think people should try and find out what happened,” Trump said Monday.

Recent studies show that survival for men with prostate cancer that has spread to the bone is just under two years. But this form of cancer, though aggressive, can sometimes be controlled. Here's what oncologists who treat prostate cancer say are the most common strategies for treating a cancer like Biden's, and some of the challenges.

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.

After the announcement that Biden has an aggressive form of prostate cancer, Trump Jr. initially reposted a message on X (formerly Twitter) wishing Biden a “speedy recovery” and writing, “Agree 100%.” But he quickly pivoted to attack mode, taking aim at former first lady Jill Biden, who holds a doctorate in education and is not a medical doctor.