Democrat Hillary Clinton and Republican Donald Trump were favored to win their parties' U.S. presidential nominating contests in New York state on Tuesday, but voting was overshadowed by official confirmation that more than 125,000 people were missing from New York City voter rolls and reports of other irregularities.

New York City Comptroller Scott Stringer ordered an audit of the city elections board after it confirmed the names had been removed from voter rolls. The city has roughly 4 million voters considered active for the presidential primaries.

Stringer complained in a letter to the board that it was "consistently disorganized, chaotic and inefficient." He cited faulty ballot scanners, late-opening polling stations and scant staffing.