John Fetterman says JD Vance is more focused on 'silly performance art' than trying to pass the railway safety bill they've introduced together

• Sens. JD Vance and John Fetterman, populists from different parties, worked together on a rail safety bill.
• Fetterman accused Vance of "silly performance art" over his doomed effort to ban mask mandates.
• Vance argued his mask crusade isn't distracting from the rail bill, and that he's been building support for it.

Two of the Senate's most prominent self-styled populists — each from different parties — are at loggerheads amid the stalled railway safety bill they drafted together.