Nassau County Executive Bruce Blakeman is set to announce his bid for New York governor on Tuesday — facing off against Rep. Elise Stefanik for the GOP nomination, The Post has learned.

Sources said Blakeman will formally declare his candidacy on Tuesday morning, following weeks of speculation over whether the Long Island pol, a longtime friend of President Trump, would take the fight to Stefanik, a prominent White House ally.

“Bruce will focus on making Empire State more affordable and safer while putting New York first,” a source said.

Speculation has been swirling over whether Trump will weigh in on the race and endorse a Republican nominee in next year’s primary to face off against Democrat incumbent Gov. Kathy Hochul.

Asked if he’d support either one of his allies, Stefanik or Bla

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