Video on social media showed an unidentified man wearing a red "Make America Great Again" cap heatedly insisting that he was entitled to a seat and arguing with fellow passengers, at one point calling one a "moron" who didn't speak English.

The caps were popular in President Donald Trump's campaign.

Sunday's incident ended with local airport authorities escorting the man off the plane while angry passengers chanted "Lock him up," cellphone footage showed. The chants likely also referred to the bitter election, when Trump frequently led chants of "Lock her up" about his rival, Hillary Clinton, who was accused of mishandling emails as secretary of state.

Passenger Clark Gredona wrote on Facebook that the man felt entitled to several seats next to him because he could not get an upgrade. He berated a female passenger by calling her "Hillary" and a "lesbian," Gredona wrote.

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The flight departed Shanghai five hours after its scheduled takeoff and made an unscheduled stop in San Francisco to change crew. It arrived in Newark at 2:25 a.m. Monday, eight hours after its scheduled landing time.