The International Association of Fire Fighters, the first union to endorse President Joe Biden in 2020, said it will not endorse a candidate this election cycle.

The snub is all the more embarrassing for Democrats, as Gov. Tim Walz (D-MN) spoke at the group’s last convention in August, though his opponent, Sen. J.D. Vance (R-OH), did as well. The latest nonendorsement could spur trouble for Democrats in November.

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