Trump, the FBI, and the House Oversight Chair All Confirmed the Same Thing This Weekend: The Scientist Disappearances Are Now a Federal Investigation.

On April 17, 2026, White House Press Secretary Karoline Leavitt posted on X that the Trump administration is “actively working with all relevant agencies and the FBI to holistically review all of the cases together and identify any potential commonalities that may exist” in the deaths and disappearances of eleven US scientists and government employees with ties to classified nuclear, aerospace, and UAP-adjacent research. The same day, Trump told supporters at a Turning Point USA event in Phoenix that the cases were “pretty serious stuff” and that he had “just left a meeting on that subject,” adding, “I hope it’s random, but we’re going to know in the next week and a half.” On April 19, House Oversight Chair James Comer escalated further, demanding formal briefings from the Department of Energy, the Pentagon, NASA, and the FBI, telling Fox News the pattern “would suggest that something sinister may be happening.” What had been a fringe story tracked mostly by UAP researchers and independent journalists is now a formal, multi-agency federal investigation.

The sequence of events that brought it to this point ran over four days. Fox News White House correspondent Peter Doocy put the question directly to Leavitt in a briefing: “There are now ten American scientists who have either gone missing or died since mid-2024. They all reportedly had access to classified nuclear or aerospace material. Is anybody investigating this to see if these things are connected?” Leavitt acknowledged she had not been fully briefed but called it “definitely something I think this government administration would deem work worth looking into.”

By April 17, the administration had moved from acknowledgment to investigation. Leavitt’s post on X confirmed the FBI is now involved in a coordinated review. She described the scope as holistic — meaning all eleven cases are being examined together, not individually. Energy Secretary Chris Wright confirmed on Fox News Sunday that the Department of Energy has opened a formal probe, adding that investigators had “not found anything alarming yet.”

Rep. Eric Burlison, who serves on the House Oversight Committee and whose office had been tracking the cases for more than a year before Trump’s public acknowledgment, told Fox that the pattern is “too coincidental” to ignore and that the scientists’ access to classified aerospace, defense, and UAP material “almost certainly” played a role. He noted that several disappeared by walking away from their homes on foot, leaving phones and wallets behind — behavior he described as inconsistent with standard tradecraft for cleared personnel. He raised the possibility that hostile foreign actors from China, Russia, or Iran could be involved.

The Eleven Cases Now Under Review

The federal investigation covers eleven individuals. The core cases, as confirmed across Fox News, NewsNation, and the White House briefing, are: retired Air Force Maj. Gen. William Neil McCasland, 68, who commanded the Air Force Research Laboratory at Wright-Patterson and disappeared February 27, 2026, four days after Trump’s UAP disclosure directive; NASA JPL Materials Director Monica Reza, 60, who vanished June 22, 2025 while hiking in the Angeles National Forest, 30 feet ahead of another hiker; former Los Alamos National Laboratory employee Anthony Chavez, 79, last seen leaving his home on foot in 2025; LANL administrative employee Melissa Casias, 53, last seen walking along a New Mexico highway in June 2025; nuclear weapons contractor Steven Garcia, 48, who walked out of his Albuquerque home on August 28, 2025 carrying only a firearm; JPL scientists Michael David Hicks (died July 2023) and Frank Maiwald (died July 2024); Caltech astrophysicist Carl Grillmair, 67, shot at his home February 16, 2026; MIT plasma physicist Nuno Loureiro, 47, shot at his home December 2025; Novartis chemical biologist Jason Thomas, 45, body recovered from a Massachusetts lake March 2026; and UFO researcher Amy Eskridge, 34, who founded the Institute for Exotic Science to develop public anti-gravity technology disclosure and died of a gunshot wound in 2022, ruled a suicide.

The official position remains that no confirmed link between any of these cases has been established. What has now been confirmed is that the US government has decided the question of whether a link exists is serious enough to investigate formally, at the highest levels.

What Burlison Has Added This Weekend

In the days surrounding the FBI announcement, Burlison made an additional disclosure: he had tried to contact McCasland twice about UAP research before the general disappeared, and McCasland never responded. He also revealed he has been investigating what online researchers and satellite analysts have identified as an unusual mountaintop facility outside Seoul, roughly 270 feet in diameter, officially listed as an aeronautical communications station but operated by a subsidiary of South Korea’s national intelligence apparatus. Burlison has suggested he intends to visit the site as part of his UAP-linked investigation.

Journalist Ross Coulthart, who has covered the UAP story for NewsNation, called McCasland’s disappearance “a grave national security crisis for the United States” and described the general as someone with “some of the most sensitive secrets of the United States in his head.”

Burchett confirmed he had a 14-minute private conversation with Trump about UFO disclosure this week.

Sources: Fox News — Mystery Clouds Deaths, Disappearances of Scientists with UFO Research Ties: Timeline (April 17, 2026) — LiveNOW from FOX — White House Probing Disappearances, Deaths of US Scientists: Pretty Serious Stuff (April 17, 2026) — IBTimes UK — The Immovable UFO: Why Eric Burlison’s Search for a Giant Craft Could Solve the Mystery of 11 Missing Nuclear Scientists (April 20, 2026) — Fox LA — 11 Missing or Dead Scientists Draw Federal Scrutiny, Including 4 Tied to LA County (April 19, 2026) — RVM News — High-Level Scientists Missing or Dead Under Mysterious Circumstances, Federal Probe Underway (April 19, 2026) — Newsner — White House Addresses Mystery of 10 Missing or Dead Scientists (April 17, 2026) — NewSX — UFO Scientist Deaths Explained (April 18, 2026)