Following up on a campaign promise that appealed directly to his Rust Belt base, President-elect Donald J. Trump said Thursday that he had reached out to the Carrier air conditioner company in Indiana to ask it not to move more than 2,000 factory jobs from Indiana to Mexico.

In a post on Twitter Thursday morning, Mr. Trump said: “I am working hard, even on Thanksgiving, trying to get Carrier A.C. Company to stay in the U.S. (Indiana). MAKING PROGRESS - Will know soon!”