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.

In today’s edition, we examine John Fetterman’s place in the Senate, where the Pennsylvania Democrat is increasingly on an island. Plus, Kristen Welker previews her interview with Transportation Secretary Sean Duffy on this Sunday’s “Meet the Press.” Sign up to receive this newsletter in your inbox every weekday here.