A nnie Tomasini on Friday became the third Biden administration official to plead the Fifth Amendment in a House panel's investigation into former President Joe Biden's mental fitness and use of a presidential autopen while in office. Tomasini was called on to appear before the Republican-led House Oversight Committee for a closed-door interview.

As the GOP probe into Biden’s mental acuity and use of an autopen expands, a growing number of his top aides are being swept up in a thorny legal predicament.