Republican presidential candidate Mitt Romney is raising new questions in Florida about his rival Rick Perry's position on Social Security.
Romney said at a Miami town hall-style meeting that Perry's proposal to have states run the retirement system won't work. Romney asks what would happen if some states chose not to create a Social Security plan, and what would happen if people move from one state to another with a different system.
Romney, a former Massachusetts governor, says he wants to keep Social Security intact at the federal level and make changes to keep it financially healthy in the future.
The Miami event comes the day before the next big GOP presidential debate in Orlando. Social Security is likely to be a key issue at the debate.