Steven Spielberg spent decades putting aliens on the big screen. Now, the legendary filmmaker admitted years of UFO reports and eyewitness accounts have convinced him that the people claiming to have seen them deserve to be believed.

While promoting his new film "Disclosure Day," Spielberg said widespread documentation, smartphone videos and testimony from military and government figures helped move the subject of UFOs from tabloid territory into the mainstream.

Though he said he had never personally seen a UFO, the Oscar-winning filmmaker acknowledged he had grown more willing to trust those who claimed they had.

"Well, the younger me wouldn't have been exposed to the incredible plethora of visual documentation of what's been going on," Spielberg said during an appearance on "The Daily."

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"Seeing is believing and until I see something myself. And why I have not seen a UFO – I don't understand why they haven't come to me yet. I mean, I feel like their agent. So I have not had any sightings whatsoever. However, having said that, so much of the believers, I now believe the believers."

Spielberg said he started paying closer attention when UFO stories were no longer confined to the fringes and high-profile voices began stepping forward with their own accounts.

"...I really feel that things started to get into the mainstream. And then after that, there was a lot of documentaries were being made, and I saw all of them – every doc made about this. And you can't make a doc unless people come forward. Now, there, it's not under oath, but a lot of people from Congress, from the military started coming forward."

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For "Disclosure Day," starring Emily Blunt and Josh O'Connor, Spielberg said he wrote a story based on science fiction.

"The foundation upon which I built my science fiction story is a very, very credible foundation, just based on everything that I've absorbed over many, many decades, but especially over the last decade," he explained. "And there is a consistency in the reporting."

"There is circumstantial evidence from tens of thousands, if not hundreds of thousands of people who have claimed, not just in America, but all over the world, to have seen something or met people who have had seen things," Spielberg added.

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Spielberg's "Disclosure Day" centers on the revelation that extraterrestrial life has been secretly known about for decades, following a whistleblower and a TV meteorologist who become entangled in efforts to expose a massive government cover-up.

The movie marks Spielberg's return to the UFO and alien themes that made films like "Close Encounters of the Third Kind" and "E.T." cultural landmarks.