Recent outbursts and stories surrounding Sen. John Fetterman of Pennsylvania have raised questions from those on Capitol Hill and in his inner circle about his mental health. A video of Fetterman on a flight back to Pittsburgh shows him arguing with a flight attendant over his seat buckle, which the attendant said needed to be visible.

The former chief of staff to Senator John Fetterman last year wrote to a doctor who had treated him, pointing to “warning signs” that suggested the senator could be backsliding on his recovery from a mental health crisis.

Pennsylvania Sen. John Fetterman, the lawmaker known for his unconventional and irreverent brand of politics, is in the news again after a blowup at a closed-door meeting with union allies and former staff aides who aired concerns about his mental health.