A longtime Islamic Society of North America leader appears to be at the center of an inquiry by U.S. Sen. Chuck Grassley about a "hands off" list within the U.S. Customs and Border Protection (CBP) service.

Grassley, R-Iowa, released a letter on Tuesday that he sent to the Department of Homeland Security in February asking for an explanation of what "hands off" meant, the Washington Post reports. The letter included CBP emails from 2012 about the impending U.S. visit of "an Egyptian born Canadian citizen who was a member of the Muslim Brotherhood" and a close associate of a supporter of Hamas, Hizballah and Palestinian Islamic Jihad.

The documents are redacted, blocking the subject's identity.

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