Donald Trump Jr. is facing backlash after mocking Joe Biden’s prostate cancer diagnosis. On May 19, 2025, he reposted a message on X claiming Biden’s cancer was likely known during his presidency. Trump Jr. added, “How did Dr. Jill Biden miss stage five metastatic cancer?” sparking outrage online.

Critics, including author Don Winslow, condemned the post. “Disgusting,” wrote one user. Others called it “shameful” and “inhumane,” especially given the personal nature of the diagnosis. One user wrote, “Mocking a cancer diagnosis is a new low.”

Previously, Trump Jr. had shared a more respectful message but quickly shifted to conspiracy-laced accusations. In contrast, his father, President Donald Trump, responded with sympathy: “Melania and I send our best wishes to Joe and his family.”

Biden, 82, was recently diagnosed with advanced prostate cancer, which has spread to his bones. Doctors say it’s hormone-sensitive, offering treatment options. Jill Biden, unfairly targeted in Trump Jr.’s remarks, remains a respected educator with a doctorate in education.