Obama will speak to the same group Friday. The speeches come as the Supreme Court prepares to render judgment on a get-tough Arizona law and after Obama announced his new deportation plan.

Romney again refused to say whether he would reverse Obama's policy, promising his "own long-term solution that will replace and supersede the president's temporary measure."

The former Massachusetts governor has struggled in recent days to clarify his immigration policy as he pivots from the sharp tone that defined the months-long GOP primary to a general election audience in which Latinos will play a critical role.

During the primaries, Romney and his Republican opponents focused on border security and English as the official language, but the former Massachusetts governor didn't spell out precisely what he would do to address the nation's immigration problem.