Hasan Piker, an influential left-wing personality, said he was detained and questioned by U.S. Customs and Border Protection over the weekend.

Hasan Piker, an online political commentator, was stopped and questioned by US Customs and Border Protection agents after returning to the country from France, he said on his Twitch livestream Monday.

Mr. Piker, who was born in the United States, said he was passing through Global Entry, a U.S. Customs and Border Protection program that eases security checks for travelers deemed to be low-risk, when an agent asked him to step aside.