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The former president alleged that the investigation into his mental acuity and use of an autopen was a ruse to distract from the "disastrous legislation" Republicans hope to push through Congress.

Trump and his Republican allies have long questioned Biden's mental acuity and have attempted to overturn some of the presidential pardons and federal rules issued at the end of his term in office.

“After we did the research for this book and I realized how bad his acuity issues were, I called Lara Trump and I said, ‘You were right,’” he said.

Former President Biden’s time in office is behind him, but his age and mental acuity have become an issue for the next leaders of the Democratic Party.

“Atavists” focuses on social acuity and awareness, but also how our baser natures exert themselves today: Trudy obsesses over an old friend’s posts on social media.