As a young man in the early 1980s, Obama [then using the name Barry Soetoro] was part of a secret CIA project to explore Mars.
The future president teleported there, along with the future head of DARPA. That's the assertion, at least, of a pair of self-proclaimed time-traveling, universe-exploring government agents.
Andrew D. Basiago [Project Pegasus] and William Stillings insist that they once served as "chrononauts" at DARPA's behest, traversing the boundaries of time and space. They swear: A youthful Barack Obama was one of them. More
Why deny a "non-story"?
Why would the White House or CIA waste their time officially denying such a preposterous claim?
While it is true that there is secret teleportation and time travel technology in the hands of the shadow government at levels high above top secret, it is certainly not accepted in the popular imagination or our consensus reality.
Is the White House trying to make it part of the public discourse. Just as people did not believe the government has a documented history of paying to study "remote viewing" (psychic spying as popularized in the movie "Men Who Stare At Goats"), they do not believe sci-fi claims that what is shown on Star Trek and Star Wars could bear any resemblance to reality.
But along with alien contact, UFOs of many varieties with many agendas, they do. Sleep well. Time travel is real, and it does not lead to irreconcilable paradoxes after all.