"I think they will be comfortable telling the public what we do know, and what is still yet to be explained," Schiff said when asked what people can expect from the hearing. "But they'll be very careful not to speculate that this is some extraterrestrial or this is some foreign adversary with some… unknown technology. They will set up the limits of what we know what we don't."

The government has said that UAP "probably lack a single explanation." Neither classified nor unclassified reports from the government so far rule out space aliens. But other possible explanations are "airborne clutter" like birds and balloons, "natural atmospheric phenomena," like ice crystals, highly classified U.S. government programs, or "foreign adversary systems" from Russia, China or other countries.

"Let's assume that it's… another country, another nation or another group that's operating something that we don't fully understand," Heritage Foundation senior fellow for naval warfare and advanced technology Brent Sadler told Fox News Digital. "That's a definitely a security threat… that we can't necessarily defend against because you can't defend against something you don't understand."

Sadler added that the classified nature of the government's UAP information could make it hard to learn much from the hearing. Foreign nations will likely be watching Moultrie and Bray to potentially learn new information about U.S. military capabilities. But, he said, lawmakers could use general questions to get an idea of how much a threat UAPs actually are. 

"They don't have to go classified if they ask it in the general and say, ‘Are any of these reported incidents… a national security threat for our defense?’" Sadler said. "Hopefully the answer is no."

Sadler further added that even if UAPs don't belong to a hostile power, there's a risk for military personnel, especially pilots, if they cannot detect UAPs or don't know how to react to them. 

If UAPs are from a foreign nation, Sadler said, they are most likely for intelligence purposes. He said if the hearing reveals that to be true, it could "galvanize" Americans to refocus on science like the "Sputnik moment where the Soviet Union launched the satellite, and it scared everyone into action."

The push for more information on UFOs is one of the few bipartisan issues in Congress. 

In 2021 a group of bipartisan Senators introduced an amendment to the National Defense Authorization Act calling for a new government office as a "central repository" for UFO information and their threat to the U.S. It would be a collaborative effort between the Defense Department and the Director of National Intelligence. 

Sen. Kirsten Gillibrand, D-N.Y., led the effort, joined by Sen. Marco Rubio, R-Fla., and several others across the aisle. In the House, Rep. Elise Stefanik, R-N.Y., a member of the Counterterrorism, Counterintelligence, and Counterproliferation Subcommittee, said she wants the Tuesday hearing to focus on protecting Americans. 

"My hope is that this hearing focuses on transparency for the public and protecting our national security," Stefanik told Fox News.