President Donald Trump intensified his assertions — without evidence — that officials using an autopen undermined the actions of his predecessor, Joe Biden, even suggesting that “essentially whoever used the autopen was president.

Investigation will examine if Biden's aides deceived the public about his mental state and whether presidential authorities were unconstitutionally exercised during his term.

Former President Joe Biden released a statement after President Donald Trump ordered a formal invesigation: “Let me be clear: I made the decisions during my presidency. I made the decisions about