Washington (CNN) President Donald Trump has hardly weighed in on the strike at General Motors, instead offering his own US-Mexico-Canada Agreement as a remedy for what's ailing the auto industry -- but the prospect of the much-touted deal doesn't seem to have convinced workers that their jobs won't move to Mexico.

Nearly 50,000 workers were off the job for a second day Tuesday as the United Auto Workers union continued to negotiate over wages and health benefits. One sticking point is bringing back manufacturing jobs that have moved to Mexico.

A UAW source close to the negotiations told CNN that the automaker would not budge on this point. A GM spokesperson said the company has offered to create more than 5,400 jobs and invest $7 billion in the United States.

The USMCA still needs to be approved by Congress. But some of the major changes it would make are meant to address jobs moving to other countries.

"I have a respectful message for all of the United Auto Workers who are currently on strike," Vice President Mike Pence said Tuesday during a speech at the Heritage Foundation.

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