WASHINGTON — Former White House chief of staff Jeff Zients revealed to Congress Thursday that former President Joe Biden’s memory and decision-making capability deteriorated while in office, according to a source familiar with the ex-aide’s transcribed interview.

Zients, who declined to answer reporter questions, also told the House Oversight Committee that he told White House physician Kevin O’Connor that Biden should have “a full medical workup” — including a cognitive exam — after his disastrous June 27, 2024, debate performance , added the source.

In that forum, the Democrat stumbled over his words, spoke with a soft and raspy voice, and delivered non-sequiturs about public policy — declaring at one point that his administration had “finally beat Medicare.”

Biden’s campaign and

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