A Rutgers University professor who taught a course on anti-fascism was blocked from leaving the US for Spain on Wednesday night, according to media reports, hours after Donald Trump hosted a White House roundtable highlighting the impact of antifa – or “anti-fascist” – far-left activists.

Mark Bray, an historian who published the 2017 book Antifa: The Anti-Fascist Handbook, and has taught courses on anti-fascism at the New Jersey university, was attempting to board a plane at Newark airport bound for Europe when he was informed at the boarding gate that the reservations for him and his family had been cancelled.

‘Someone’ cancelled my family’s flight out of the country at the last second,” Bray posted on Bluesky social media. “We got our boarding passes. We checked our bags. Went through security. Then at our gate our reservation ‘disappeared.’”

No details on who canceled the flight.