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The family, who had traveled to Canada for a few days to visit Wilwal’s sister, also received a vague warning from Canadian border officials when they entered Canada. Wilwal might receive more questioning than usual when he returned, they said according to the lawsuit, because of a notation on his name in their records.

A border security document, recording the family’s arrival and submitted by their lawyers as case evidence, describes “a confirmed subject record hit.”

Because it’s unclear who is on the watchlist, it is unknown how many of its members are Muslim, like the Wilwal and Abdigani family.

The Council on American-Islamic Relations (CAIR), a Muslim advocacy group, has alleged that Customs and Border Protection officers discriminate disproportionately against Muslims at airports and border crossings and at a more frequent rate since Trump sought to ban the citizens of seven majority-Muslim countries. While the Wilwal and Abdigani family was detained during the Obama administration, CAIR said earlier this year that it had documented a significant increase in complaints of harassment involving U.S. border authorities’ treatment of Muslims during Trump’s first 100 days in office, rising from 17 during the same period last year to 193 this year.

CBP did not respond to a request for comment on those numbers.

Handeyside said reports received by the ACLU also “suggest that people from Arab, Muslim and South Asian communities have born the brunt-as has long been the case-of these abuses, and have been especially targeted for conduct like this.”

A border official’s summary of the encounter on a document submitted by the family’s lawyers as evidence includes notes about the family’s religion. “It should be noted that WILWAL stated that he and his family do not associate themselves with any type of religion. It should also be noted that during a border search of a cellular telephone belonging to WILWAL’s step son . . . and app called ‘Muslim Pro’ was discovered,” the document reads.

Wilwal and Abdigani declined, through their lawyers, to comment.

With a file from The Associated Press