UFO researcher Brad Sparks thoroughly documented a UFO heading towards Eisenhower's summer home in 1957 that was noted and documented secretly, both by Norad and Project Blue Book at the time.
This prompted an immediate presidential brief, including both Eisenhower and all of the directors of the U.S. intelligence community that Monday morning, September 23rd.
They varied in altitude from 50,000 to 135,000 feet, which remains unattainable by aerospace vehicles even now, and yes, they were headed directly at President Eisenhower's summer white house.