In a visit to Florida's state capital on Tuesday, Republican Jeb Bush focused on the politically explosive topics of immigration and education reform, while emails were released from his time as governor there in an effort to burnish his credentials as he eyes a 2016 presidential bid.

Bush told a friendly audience of 300 longtime supporters at a $1,000-per-plate luncheon that his party should approach immigration as an opportunity to spur economic growth, a view at odds with hardliners in his party.

"People, the best and brightest around the world, want to come here, so we should fix our immigration system," he said, also stressing his support for securing U.S. borders.