Mrs Clinton, and her campaign manager John Podesta, have been claiming for months she will open the so-called top-secret X-Files if she makes it into the White House.
But, taking part in a radio talk show with a man who claims he was abducted by aliens, she accepted she could be blocked.
The Democrat frontrunner was campaigning in East Harlem, New York, when she took part in the Power 105.1 Breakfast Club.
Asked by one of the show's hosts, Lenard McKelvey - also known as Charlamagne the God - who believes he was abducted by aliens several times, if she would really deliver on her quest for truth about UFOs and the top-secret military base Area 51 in the Nevada desert, she said simply, “I am.”
However, she added a caveat that she will not be able to release any files that are closed due to national security.
She said: "I mean, if there’s some huge national security thing and I can’t get agreement to open them, I won’t, but I do want to open them because I’m interested.”
She's already back peddling. To read more, click here.