After mislabeling Biden's stage 4 prostate cancer diagnosis as "stage 9," which does not exist, Trump again raised questions about the former president's cognitive health

President Donald Trump delivered a nice message to Joe Biden on Sunday following the former president’s revelation that he was battling aggressive prostate cancer, and Donald Trump Jr. appeared to do the same. That did not last long though.

Donald Trump Jr. has been called out after doubling down on his 'sarcastic' response to Joe Biden's prostate cancer diagnosis

Donald Trump Jr. didn't hesitate to fuel conspiracy theories about Joe Biden's prostate cancer diagnosis. The first son of the United States took to social media on Sunday, May 18, reacting to the former Democratic president's health revelation just moments after Biden's personal office released a statement regarding his ongoing medical battle.

For a closer look at the loved ones by Joe's side amid his cancer battle ... Naomi and Tiffany Trump were at Penn together—future presidents Donald Trump and Biden both attended their graduation ...