New Jersey Gov. Chris Christie says he has asked the Trump administration to suspend regulations that allow airlines to overbook flights.

Christie, a Republican, sent a letter to U.S. Transportation Secretary Elaine Chao on Tuesday, citing a passenger who was dragged off a United Express flight in Chicago on Sunday.

Christie called the practice of “bumping” passengers off flights “unconscionable.”

United is a dominant carrier at New Jersey’s Newark Liberty International Airport.

A message left with Chao’s office was not immediately returned.

A spokesman for President Donald Trump says it was “troubling” to watch video that spread across social media of a passenger being dragged off of a United Airlines flight.

But White House press secretary Sean Spicer says it’s unlikely the federal government will launch a separate investigation.

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Photo Credit: This April 9, 2017 image made from a video provided by Audra D. Bridges shows a passenger being removed from a United Airlines flight in Chicago. Audra D. Bridges via Associated Press