First off its Commander IN Chief.
Secondly Presidents do not micro manage Aerospace development.There are hundreds or thousands of black ops projects the Presidents never know of.Presidents like Kennedy and Clinton were not seen as friendly to the armed forces and would have been totally in the dark about an awful lot of what they actually did.
I was a big believer in UFOs/Aliens and have researched the hell out of them.
I've concluded the two are not related in the slightest.
I firmly believe UFO's are out there but are classified military aircraft.There is precedence for this with the B2 Stealth bomber.My biggest point on this is the amount of close encounters that have seen cars die or watches.Reeks of electro magnetism,and I highly doubt Aliens have any care to stop a car or watch.Its military technology.
As for aliens,I dont believe they are from space at all.Hyperdimensional entities that exist outside of time.Try taking DMT sometime.It messes with your perception of time.Then you start interacting with Aliens.Everyone has the same experience on DMT.It doesnt send you into outer space.DMT is naturally produced in the brain in small doses...its my belief this is what causes the abduction experience.