Grusch is one of several whistleblowers who recently talked about the government's involvement in the discovery of UFOs. (Related: Former intelligence official: US has at least a dozen alien spacecraft in its possession.)
In his sworn testimony, Grusch included allegations that the government is running a classified UFO reverse-engineering program. Grusch's attorney and former Intelligence Community Inspector General (ICIG) Charles McCullough also stepped forward for the first time to speak publicly on his client's accusations.
McCullough told BBC Radio that Congress requires more information on UFOs "to properly oversee things going on in the executive branch."
While Grusch has claimed he has "firsthand access" to some evidence in support of his allegations, neither Grusch nor McCullough has stated that the whistleblower has seen crashed craft or recovered "non-human intelligence" with his own eyes.
"Our government relies on congressional oversight, the checks and balances of congressional oversight. David's allegation, at its base, is essentially that Congress does not have access to the information it needs to properly oversee things going on in the executive branch," said McCullough.
McCullough also verified that his client Grusch did, in fact, brief both House and Senate intelligence committees behind closed doors.
"He's briefed both of the intel committees and he's had a two-hour hearing with two hours of testimony last week," he said. And the intelligence committees seem to have taken Grusch's testimony seriously.
Last month, Senate Majority Leader Chuck Schumer in cooperation with Republican Sens. Marco Rubio of Florida and Mike Rounds of South Dakota, led attempts to appoint a nine-member review panel to evaluate all classified government records on UFOs.
That amendment, which included language repeating Grusch's allegations, has since passed a Senate vote.
"It is unlikely that Grusch, speaking to Congress under oath, would perjure himself so brazenly over such specific, falsifiable facts. Particularly with his high-profile attorney sitting directly behind him," former Department of Defense official Marik von Rennenkampff said.
If Grusch intentionally gave false information to the ICIG in his formal complaint, the UFO whistleblower could face a fine of up to $10,000, up to five years in prison or both.
Von Rennenkampff added that with these penalties, it is extremely unlikely that several high-level and highly cleared officials would falsely claim to have first-hand knowledge of myths and rumors.
Meanwhile, a top Pentagon official called the recent UFO hearing "insulting" to employees who are investigating the UFO sightings. Dr. Sean Kirkpatrick denounced Grusch's testimony and noted that the whistleblower never worked for a Pentagon office responsible for investigating UFOs.
But Grusch never claimed to have worked in such office. "Dr. Kirkpatrick oversaw our activities and what we were doing and the money we were spending. I never said I was a part of the core team, so I believe it was just lost in translation or misconstrued," Grusch said.
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