WASHINGTON -- Republican presidential candidate Jon Huntsman doubled down on Sunday on his criticism of front-runner Mitt Romney, saying the former Massachusetts governor's "flip-flops" could cost him the GOP nomination. "I think there is an issue on the flip-flops as it relates to trust," said Huntsman, a former Utah governor and ambassador to China, during an appearance on NBC's "Meet the Press." "I don't know if he can go on to beat President Obama given his record.""When there's a question about whether you're running for the White House or running for the waffle house, then you've got a big problem with the American people," he added.