The thirteen days of the Cuban missile crisis begin.
President Kennedy is visited by Soviet Foreign Minister Andrei Gromyko, who asserts that Soviet aid to Cuba is purely defensive and does not represent a threat to the United States.
American military units begin moving to bases in the Southeastern U.S. as intelligence photos from another U-2 flight show additional sites; and 16 to 32 missiles.
President Kennedy leaves for a scheduled campaign trip to Ohio and Illinois. In Washington, his advisers continue the debate over the necessary and appropriate course of action.
President Kennedy returns suddenly to Washington and after five hours of discussion with top advisers decides on the quarantine.
After attending Mass at St. Stephen's Church with Mrs. Kennedy, the President meets with General Walter Sweeney of the Tactical Air Command who tells him that an air strike could not guarantee 100% destruction of the missiles.