President Donald Trump claimed that "treasonous thugs" within former President Joe Biden's administration allegedly took advantage of his mental decline in a post shared on his Truth Social account Tuesday (May 20).

Trump said Biden never wanted open borders nor to have illegal migrants convicted of past crimes "flow into our country," but was taken advantage of from officials who "wanted to destroy" the United States in the lengthy post.

"Joe Biden was not for Open Borders, he never talked about Open Borders, where criminals of all kinds, shapes, and sizes, can flow into our Country at will," Trump wrote. "It wasn’t his idea to Open the Border, and almost destroy our Country, and cost us Hundreds of Billions of Dollars to get criminals out of our Country, and go through the process we are going through now. It was the people that knew he was cognitively impaired, and that took over the Autopen. They stole the Presidency of the United States, and put us in Great Danger. This is TREASON at the Highest Level! They did it to destroy our Country. The Joe Biden that everybody knew would never allow drug dealers, gang members, and the mentally insane to come into our Country totally unchecked and unvetted. All anyone has to do is look up his record. Something very severe should happen to these Treasonous Thugs that wanted to destroy our Country, but couldn’t, because I came along. MAKE AMERICA GREAT AGAIN!"

The post came days after Trump took a more somber tone to respond to Biden's advanced cancer announcement on Sunday (May 18).

"Melania and I are saddened to hear about Joe Biden’s recent medical diagnosis. We extend our warmest and best wishes to Jill and the family, and we wish Joe a fast and successful recovery," Trump wrote on his Truth Social account.

Several of Trump's conservative allies, including his son, Donald Trump Jr., publicly accused Democrats of covering up Biden's diagnosis prior to the announcement on Sunday. Oncologist Dr. Ezekiel Emanuel, who had previously served as a member of the former president's transition team and helped craft the Affordable Care Act under former President Barack Obama's administration, claimed Biden likely "had this for many years," rather than the sudden diagnosis over the weekend, during an appearance on MSNBC's Morning Joe Monday (May 19).

Biden, 82, shared a statement addressing his "very aggressive" prostate cancer diagnosis on his X account Monday morning.