WASHINGTON – President Donald Trump doesn't seem to be a believer of aliens or UFOs flying through Earth's atmosphere, although he has been briefed on them.

ABC News' George Stephanopoulos, in a wide-ranging interview, asked Trump about recent news reports about Navy pilots spotting flying objects and what he made of the apparent UFO sightings.

"I want them to think whatever they think," Trump said, raising his eyebrows and slightly grinning before adding that he did have "one really brief meeting on it."

"People are saying they're seeing UFOs. Do I believe it? Not particularly," he added.

Stephanopoulos followed up, asking the president whether he thought he'd actually know if the U.S. had any proof of extraterrestrials — a question Trump didn't appear to actually answer directly.

"I think our great pilots would know and some of them really see things that are a little bit different than in the past, so we're gonna see, but we'll watch it," Trump said, following his answer with a promise that Stephanopoulos would "be the first to know" if there was alien life.

Trump's comments followed a number of reports chronicling how the government has examined UFO sightings and a report in the New York Times about Navy pilots reporting bizarre flying objects, including one that looked like a "spinning top" and another with no visible engine that could reach 30,000 feet and hypersonic speeds.

The Times report includes a number of videos filmed by Navy pilots showing the aircraft and the curiosity of the pilots who couldn't figure out what the objects were and how they were so quick, even when they were flying against the wind. But the report makes clear that the Defense Department doesn't believe the objects are from beyond Earth and that an explanation can almost always be found for incidents like these.

Unexplained flying objects have been seen by pilots for decades. In 2017, the Department of Defense released footage from 2004 showing Navy Pilots coming into contact with an unidentified flying object off the San Diego coast.

In an interview with the Times, one of the pilots, David Fravor, said mysterious aircraft were being investigated after appearing on radar at 80,000 feet, dropping suddenly to 20,000 feet then hovering there before dropping out of radar or shooting back up in the sky.

Fravor said he went to investigate one of the aircraft, saw it moving erratically then hovering just above the Pacific Ocean. As he got closer to the object, it zipped off.

"It accelerated like nothing I’ve ever seen," he told the Times, adding the incident, which was never explained, left him feeling "pretty weirded out."