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A chance encounter between a voter and Curtis Sliwa on the Upper West Side highlights the challenges facing the Republican mayoral nominee amid mounting calls for his withdrawal from the race.

The Guardian Angels founder was speaking outside the 96th Street station on Monday morning, one day after Mayor Eric Adams had dropped out of the race. Bill Apple, 76, emerged from the station and ran into Sliwa.

The registered Democrat donated twice to Sliwa, whom he described as someone who “knows the city.”

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