Muhammad Ali Jr. had just returned to Florida from Jamaica, where he had accompanied his mother, Khalilah Camacho-Ali, who was there giving a speech about black history.

After arriving at the Fort Lauderdale-Hollywood airport, Ali Jr. — son of one of the greatest boxers of all time — was detained and asked at least twice about his religion, according to family friend and attorney Chris Mancini. Ali — born in Philadelphia in 1972 — and his mother are both Muslim.

‘‘To the Ali family, it’s crystal clear that this is directly linked to Trump’s efforts to ban Muslims from the United States,’’ Mancini told the Courier-Journal of Louisville, Ky., on Friday about the alleged incident, which occurred on Feb. 7.

Late last month Trump signed an executive order calling for a temporary travel ban on citizens from seven Muslim-majority countries in the Middle East and Africa. The order, which critics accused of being a thinly veiled attempt to discriminate against Muslims, has since been rejected by a federal appeals court and effectively overturned.

Mancini told the Courier-Journal that Ali and his mother were initially flagged by immigration agents for their ‘‘Arabic-sounding’’ names. He said Camacho-Ali was not detained after she showed officials a photograph of herself with her ex-husband, but when Ali Jr., who holds a US passport, could not produce a photograph to show of himself with his father, who died last year, immigration officials separated Ali Jr. from his mother, then detained him for about two hours.

Mancini told the Miami New Times that immigration officers asked Ali Jr. about his religion within the first 30 minutes of being detained and again when he was taken to a small holding room where he was held for another 90 minutes.

US Customs and Border Protection has refused to comment on the specifics of the reported detention.