Ted Cruz to keynote Tea Party rally in Fla.

Sen. Ted CruzTed CruzTrump hires ex-Cruz aide as communications director Overnight Tech: Judiciary leaders question internet transition plan | Clinton to talk tech policy | Snowden's robot | Trump's big digital push Kasich doesn't expect to speak at convention MORE (R-Texas) will keynote a major Tea Party gathering in Florida hosted by Americans for Prosperity, the group announced Friday night, a move that will further fuel speculation about his potential interest in running for president.

Cruz, who has fast become a Tea Party favorite, will join Sen. Ron JohnsonRon JohnsonPollster: Clinton leads in 5 battlegrounds Juan Williams: GOP sounds the sirens over Trump Vulnerable Republican seeks edge on homeland security MORE (R-Wis.) and conservative commentator Michelle Malkin at the event, scheduled for Labor Day weekend in Orlando. Interestingly, Sen. Marco RubioMarco RubioGrayson rips Murphy for voting to create Benghazi panel McConnell pledges redo vote on Zika after break Senate GOP campaign arm attacks Fla. Dem candidate over career MORE (R-Fla.) has been previously announced as a speaker at the event, but was not mentioned in the group's release announcing Cruz.

The Texas senator is making all the necessary moves ahead of a potential presidential run: He's also set to visit Iowa twice this summer, and has already been to South Carolina.

Headlining an event of a major Tea Party organization whose primary backers are the powerful Koch brothers is just the latest sign that he's testing the waters on a potential presidential bid.

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