Mitt Romney Port St. Lucie live video: Romney speaking in Tradition Square in Port St. Lucie

PORT ST. LUCIE — Crowds expected to top 10,000 are jamming into Tradition Square for Mitt Romney's campaign visit to Port St. Lucie.

CLICK HERE TO WATCH LIVE VIDEO WHEN IT BEGINS AROUND 3 P.M.

On a hot and humid afternoon, Romney is expected to land at Palm Beach International Airport around 2 p.m. U.S. Allen West, R-Palm Beach Gardens, will introduce GOP U.S. Rep. Connie Mack, who faces Democratic U.S. Sen. Bill Nelson in a Senate bid.

Mack will lead the way for Romney, who is expected to speak just after 3 p.m. with his wife Ann, said Romney spokesman Tom Brandt. Florida Atty. Gen. Pam Bondi also just arrived.

A handful of attendees have been taken out on stretchers from the heat. But cloud cover and potential rain are moving into the area.

Meanwhile, traffic is backing up on the shoulder of Interstate 95 about a half-mile north of Tradition Parkway.

This story will be updated.