The House Committee on Oversight and Government Reform kicked off its series of high-profile subpoena hearings last month with former Attorney General Bill Barr , who investigated the suspicious death of Jeffrey Epstein. Tuesday, however, former FBI Director Robert Mueller's hearing ran into an unexpected hitch, leading to its cancellation.

Mueller, who became the FBI director shortly before the September 11 attacks and resigned in 2013, was reportedly diagnosed with Parkinson's disease four years ago.

'We've learned that Mr. Mueller has health issues that preclude him from being able to testify.'

The AP reported that the committee withdrew its subpoena of Mueller, citing the state of his health.

"We've learned that Mr. Mueller has health issues that preclude him from being able to

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