Jeb Bush, the popular former Florida governor, said he will “stay neutral” in the state’s Republican presidential primary while warning his party’s candidates to leave the “circular firing squad” of their debates behind and start appealing to a broader audience.

Bush’s remarks, in an exclusive interview, establish a challenge for his party’s candidates as the contest advances to Florida, where the Jan. 31 primary will take the race into its biggest and most diverse arena yet.

The winner will be awarded all of the state’s 50 presidential convention delegates.

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