Namely, Trump tends to inspect “who ran the US” during the previous presidency, accusing Biden of masking his “cognitive decline” and deceiving the public about his actual mental state.
Trump supposes Biden did that by letting his aides use an autopen—a device that reproduces signatures used by presidents, including Trump, for decades—in order to authorize executive actions.

Biden accused Trump of trying to distract Americans in a time when the current administration is working towards extending tax breaks for the wealthy. He dubbed Trump’s accusations as “ridiculous.”
According to BBC, Trump said in a Wednesday statement how the American public had been “purposefully shielded from discovering who wielded the executive power” while Biden’s signature was used to endorse documents Trump described as leading to “radical policy shifts.”

“This conspiracy marks one of the most dangerous and concerning scandals in American history,” Trump concluded.

Biden issued a statement commenting on Trump’s accusations later the same day.
“Let me be clear: I made the decisions during my presidency. I made the decisions about the pardons, executive orders, legislation and proclamations,” the statement read.

“Any suggestion that I didn’t is ridiculous and false,” it added.