Regardless of his focus, Romney's appearance will draw attention to his recent rhetoric on the issue.
Facing a Rhode Island audience in April, for example, Romney drew large cheers when he said: "We want people to come here legally. And we like it when they come here speaking English."
He did not support the Obama administration's lawsuit challenging Arizona's hard-line immigration law. And he said that he would veto the DREAM Act, which would have given legal status to some children of illegal immigrants.
Obama so far has vastly outspent Romney on Spanish-language television and radio. But Romney has released targeted TV and radio ads in Spanish, including some that feature one of Romney's sons, a fluent Spanish speaker.
Romney is set to leave Florida later Thursday en route to a three-day retreat with fundraisers in Utah.
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