White House Chief of Staff Jeff Zients attends an event in the Rose Garden of the White House on May 25, 2023. Drew Angerer/Getty Images/File

Former White House chief of staff Jeff Zients testified behind closed doors at length about former President Joe Biden’s aging throughout the course of his term, including how he pushed Biden’s doctor to conduct a full medical workup, according to a person familiar with the transcribed interview.

Zients told House Oversight Committee investigators on Thursday that Biden’s decision-making slowed during the course of the administration and that the former president’s difficulty remembering dates and names worsened over time, the person told CNN.

The interview was part of the Republican-led panel’s ongoing investigation into Biden’s mental decline,

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