Former President Joe Biden ’s ex-chief of staff Jeff Zients delivered the most revealing testimony to date in the House Oversight Committee’s investigation into the alleged misuse of the autopen and internal efforts to conceal the then-president’s cognitive decline, according to a source familiar with the matter.

Zients, who appeared for a closed-door transcribed interview on Thursday, confirmed for the first time that Biden’s “decision-making slowed” during the final stretch of his presidency . He said meetings that once required three sessions began to require a fourth, and acknowledged that Biden’s speech stumbles and memory lapses worsened with age — including during his time in office.

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