Carson is attending a rally for Ricky Rosello, a gubernatorial candidate in the U.S. commonwealth’s pro-statehood party.

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A source told BuzzFeed that endorsing Puerto Rican statehood was a condition for Carson speaking at the event.

Several candidates in the 2016 presidential race are in favor of extending statehood to the island as the long as Puerto Ricans vote in favor, including Sen. Marco Rubio (R-Fla.) and former Florida Gov. Jeb Bush.

Carson’s endorsement comes several days before 13 Republicans are set to appear at the Sunshine Summit in Orlando, Fla., where Puerto Ricans are a fast-growing constituency.

While Puerto Rico cannot participate in the general election, it will award 23 delegates in the primary elections.