Which US President reported seeing an unidentified flying object?

The Jimmy Carter UFO incident was an incident in which Jimmy Carter (US President 1977-1981) reported seeing an unidentified flying object while at Leary, Georgia, in 1969.

One evening in 1969, two years before he became governor of Georgia, Carter was preparing to give a speech at a Lions Club meeting. At about 7:15 p.m (EST), one of the guests called his attention to a strange object that was visible about 30 degrees above the horizon to the west of where he was standing. Carter described the object as being bright white and as being about as bright as the moon. It was said to have appeared to have closed in on where he was standing but to have stopped beyond a stand of pine trees some distance from him. The object is then said to have changed color, first to blue, then to red, then back to white, before appearing to recede into the distance.