UAW president says he won't meet with Trump

• "He serves the billionaire class and that's what's wrong with this country," Fain added.

The big picture: Trump is scheduled to give a prime-time speech Wednesday instead of attending the second Republican primary debate.

• The 2024 GOP front-runner's trip to Michigan is likely a move to get the votes of auto workers as a historic strike plays out.

Meanwhile, President Biden joined striking autoworkers in Detroit on Tuesday, marking what appeared to be the first time a sitting president has ever visited a picket line.

• Biden spoke briefly before picketing workers, flanked by Fain, who called it "a historic moment."

What they're saying: When asked to comment on Fain's remarks to CNN, a Trump campaign spokesperson said the former president will be in Michigan talking with union workers and ensuring American jobs are protected.

• "He has always been on the side of American workers and will do everything in his power to be their voice as Crooked Joe Biden and Democrats are on the side of our foreign adversaries," he added.

Flashback: UAW president criticizes Trump ahead of Detroit speech

Editor's note: This article has been updated with comment from a Trump campaign spokesperson.