Sen. Marco Rubio, R-Fla., said this week that several high-ranking government officials have come forward with allegations involving UFOs similar to those made by former intelligence officer David Grusch.

Grusch, a U.S. Air Force officer and former member of the National Geospatial Intelligence Agency, claimed that the military has a secret UFO retrieval program that covers up evidence of "nonhuman exotic origin vehicles that have either landed or crashed."

In an interview with NewsNation on Monday, Rubio said that he's heard from unnamed officials with "high clearances and high positions within our government" who made similar claims.

"I will say I find most of these people — at some point, or maybe even currently — have held very high clearances and high positions within our government, so you do ask yourself, What incentive would so many people with that kind of qualification ... have to come forward and make something up?'" Rubio said.

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