TOLEDO, Ohio — Mitt Romney’s latest advertising campaign suggesting that the auto bailout recipients Chrysler and General Motors were shifting jobs to China drew him into a public argument with top executives at both companies, who condemned the advertisements as false on Tuesday.

“The ad is cynical campaign politics at its worst,” Greg Martin, a spokesman for General Motors, said in an interview late Tuesday. “We think creating jobs in the U.S. and repatriating profits back in this country should be a source of bipartisan pride.”

General Motors was pulled into the fray on Tuesday after Mr. Romney began running a new radio advertisement in which an announcer says, “Barack Obama says he saved the auto industry, but for who, Ohio or China?”

It went on to say that General Motors and Chrysler were planning to increase the number of cars they manufacture in China: “What happened to the promises made to autoworkers in Toledo and throughout Ohio?”