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Robert Trump — who disappeared from the social scene after divorcing his popular wife Blaine a decade ago — is alive and well and living on Long Island.

And he can’t wait until his older brother, Donald, is in the White House.

“I support Donald one thousand percent,” Robert, 67, told me. “I think he’s doing a great job. I think he’s got a great message.”

Robert, who described himself as “gainfully retired,” ended his 25-year marriage to Blaine when he fell in love with his secretary, Ann Marie Pallan, and bought her a $3.7 million house in Garden City, NY. None of his friends on the Upper East Side have seen much of him since.

“Blaine is so well loved, people were very sympathetic to her,” said one friend. “Robert was no longer welcome.”

Robert isn’t required yet by Donald on the campaign trail. But he’s willing.

“If he were to need me in any way, I’d be there,” Robert said. “Anything I could do to help.”

Of the five children of Fred and Mary Trump, Fred Jr. died of alcoholism, Elizabeth is a retired Chase Manhattan Bank exec, and their oldest sister, Maryanne Trump Barry, is a senior judge on the US Court of Appeals for the Third Circuit.

Because Maryanne doesn’t give interviews, Donald once said, “Maybe they mixed us at birth.”