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Secret Service agents detained a Brooklyn man who slithered into a Tribeca building where former President Obama’s daughter Malia interns — and begged the 18-year-old to marry him.

Jair Nilton Cardoso showed up on the fourth floor of the building on April 10, held up a sign in an office window and loudly begged for her hand in marriage, sources said.

The agents recognized Cardoso as a man who had repeatedly tried to get into the White House in the past, sources said. They told him to leave the Tribeca building and to leave her alone, sources said.