Republican front-runners Mitt Romney and Newt Gingrich
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Republicans spar over immigration

Republican front-runners Mitt Romney and Newt Gingrich have clashed over immigration at a debate in Florida, the last before the key state's primary.

While pledging he would not deport long-term illegal immigrants, Mr Gingrich accused Mr Romney of being the most anti-immigrant candidate.

Mr Romney labelled Mr Gingrich's claim "repulsive" and accused him of using "highly charged epithets".