Former White House senior adviser Anita Dunn arrived on Capitol Hill Thursday morning for a closed-door interview with House Oversight Committee investigators, as part of the panel’s intensifying probe into whether top aides worked to conceal signs of former President Joe Biden’s mental decline.

On FOX News 'Special Report,' Bret Baier and Aishah Hasnie reported on President Joe Biden Adviser, Anita Dunn, testifying before Congress on Biden's mental health: BRET BAIER: Long time adviser to former President Biden,

House Republicans reacted to Dunn's closed-door interview, saying Dunn "revealed" that Biden's "inner circle" decided against a cognitive test, concluding it would offer no political benefit, a source familiar with her account told ABC News.