During the spring and summer of 1776, Tryon and New York City's mayor, David Mathews, conspired in a miserably bungled plot to kidnap General George Washington and to assassinate his chief officers. One of Washington's bodyguards, Thomas Hickey, was involved in the plot. Hickey, while in prison for passing counterfeit money, bragged to his cellmate Isaac Ketcham about the kidnapping plot.