Democratic presidential candidate Sen. Bernie Sanders, I-Vt., greets pedestrians as he takes a walk Tuesday in New York's Times Square.

Republican presidential candidate Donald Trump fills out paperwork at his polling place Tuesday in New York.

Democratic presidential candidate Hillary Clinton and her husband, former President Bill Clinton, sign in at their voting place at the Grafflin Elementary School in Chappaqua, N.Y.

Republican presidential candidate Ted Cruz, left, is interviewed by host Bill O'Reilly during "The O'Reilly Factor" television program on the Fox News Channel Monday in New York.

Bernie Sanders speaks to Communication Workers of America on a picket line Monday in midtown Manhattan. His recent string of primary wins has tested front-runner Hillary Clinton. The Associated Press

Charlie McNeely waits for the arrival of Donald Trump at a campaign stop Monday at the First Niagara Center in Buffalo, N.Y. The Associated Press

Hillary Clinton smiles with Mikey Cole, owner of Mikey Likes It Ice Cream, during a campaign stop at his store in Manhattan on Monday. Clinton is leading in the polls in New York and needs to win the state to close in on the Democratic presidential nomination. The Associated Press