Accusations have percolated for months on social media and right-wing websites, as well as among Trump’s allies in Congress.

Former President Joe Biden left office in January, but questions about his mental acuity and decline while in office continue to mount. Here's where the investigations stand ...

Biden used at least three different autopen signatures throughout his presidency, while he was physically in Washington D.C.

Trump has been critical of Biden's use of the autopen, saying in March that the former president's pardons were "void" since “Biden did not sign them.” ...