FILE - In this Wednesday, Sept. 12, 2001 file photo, New York City Mayor Rudolph Giuliani, center, leads New York Gov. George Pataki, left, and Sen. Hillary Clinton, D-N.Y., on a tour of the site of the World Trade Center disaster. While stumping for Donald Trump in Ocala, Fla., on Oct. 12, 2016, former New York City Mayor Rudy Giuliani accused Hillary Clinton of falsely claiming to have been in New York on Sept. 11, 2001. It isn't clear what Giuliani was talking about. On many occasions, Clinton has described being in Washington, where Congress was in session, on Sept. 11 when hijacked jets began striking the World Trade Center and the Pentagon. Flights were still grounded on Sept. 12, 2001, but Clinton traveled to New York City the next day aboard a federal plane. There, she circled the smoldering World Trade Center in a helicopter, then toured ground zero with Giuliani and Pataki. (AP Photo/Robert F. Bukaty, File)