Sen. Ted CruzTed CruzCruz floats amendment to Senate healthcare bill Cruz trolls Alyssa Milano over GOP special election victory Four Senate conservatives say they oppose ObamaCare repeal bill 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 JohnsonFour Senate conservatives say they oppose ObamaCare repeal bill Senate bill contains B to stabilize ObamaCare markets Senators question need for HHS cyber office MORE (R-Wis.) and conservative commentator Michelle Malkin at the event, scheduled for Labor Day weekend in Orlando. Interestingly, Sen. Marco RubioMarco RubioIvanka Trump turns to House GOP on paid family leave Ivanka Trump weighs in on awkward hug with Rubio: ‘Fake news’ Rubio, Ivanka Trump joke about their 'alleged failed hug' 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.