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.

One of Joe Biden ’s former top communications advisers is set to appear for a scheduled interview Thursday in the House Oversight Committee’s probe of the former president’s cognitive decline and possible efforts to conceal it from the public.