Former Sen. Harry Reid, D-Nev., warned Saturday that if the U.S. "doesn't take the lead" in finding out answers about UFOs, then other countries will.

"The truth is out there. ... Seriously," the former majority leader tweeted in response to reporting Saturday that revealed the Pentagon had a set up a $22 million, multi-year program in 2007, largely by Reid's behest, to investigate reports concerning unidentified flying objects.

Both the New York Times and Politico came out with reports about the Advanced Aviation Threat Identification Program on Saturday, and both Reid and the Pentagon acknowledged the program's existence though much of it remains classified.

“I’m not embarrassed or ashamed or sorry I got this thing going,” Reid told the Times. “I think it’s one of the good things I did in my congressional service. I’ve done something that no one has done before.”

The program's funding dried up in 2012, according to former military intelligence official Luis Elizondo, who was responsible for overseeing the program. However, it reportedly still remains active with involvement of officials in the CIA and the Navy.

Reid said in a pair of tweets that no one has "the answers" yet, but cautioned that a commitment to pursing them is not only about science but also national security.

"If America doesn’t take the lead in answering these questions, others will," he said.

The reports revealed no confirmed sightings of alien space ships, but the they described how the program produced documents describing UFO sightings, including by Navy pilots, of aircraft that appeared to defy physics.