A Muslim man's green card has reportedly been rejected after he alleged Border Patrol agents served him pork sandwiches for nearly a week while he was detained.

HuffPost reports that Adnan Asif Parveen, a Spanish citizen who was born in Pakistan, applied for the green card two years ago after marrying a U.S. citizen. Parveen had not received a decision on his green card application but reportedly had a permit to legally work in the U.S. when he was detained by U.S. Citizenship and Immigration Services earlier this year for six days.

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Parveen alleges that during those six days in custody, the only food he was offered was a pork sandwich every eight hours. He says he denied the food because he practices Islam, but eventually started eating just the bread without the meat.

He also claims he was questioned about possible ties to terrorist groups and about the mosque he attends.

U.S. Customs and Border Protection (CBP) and Immigration and Customs Enforcement (ICE) declined to comment to HuffPost or confirm the incident, but noted their policy is to accommodate religious dietary restrictions.