Internal Department of Homeland Security emails show that officials discussed a "hands off" list allegedly allowing individuals with terrorist ties to enter the United States.

Sen. Charles Grassley (R-Iowa) brought the issue to light Tuesday, releasing an exchange of letters in which his office discussed the matter with top DHS officials, including U.S. Customs and Border Protection Commissioner Gil Kerlikowske.

One of the DHS emails said an individual "sued CBP twice in the past and that he's one of the several hands off passengers nationwide." The message also said that "his records were removed in December 2010 and the DHS Secretary was involved in the matter."

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