A former aide to ex-first lady Jill Biden invoked his Fifth Amendment privilege during testimony before the House Oversight Committee on Wednesday, raising red flags for some amid a probe pertaining to concerns over former President Joe Biden 's health.

Annie Tomasini, described as intensely loyal to the Biden family, faces congressional investigators Friday in the probe examining whether Biden's top aides concealed signs of his decline.

Former Biden aide Annie Tomasini invoked her Fifth Amendment right against self-incrimination during a deposition on Friday as part of the House Oversight Committee’s investigation into the Biden administration’s use of the autopen.