Former FBI Director Robert Mueller, who led the Russia investigation into President Donald Trump 's 2016 election campaign, has been diagnosed with Parkinson's disease, his family told The New York Times .

The diagnosis means that Mueller, 81, cannot comply with a congressional subpoena about the Jeffrey Epstein investigation.

Why It Matters

Epstein, a convicted sex offender and disgraced financier, died by suicide behind bars in New York while awaiting trial on sex trafficking charges in 2019.

Representative James Comer of Kentucky, the Republican chair of the House Oversight and Government Reform Committee, is leading a congressional inquiry into the government's handling of the investigation into Epstein.

As part of that investigation, Comer seeks to question a number o

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