The top Republicans on the House and Senate Judiciary Committees on Tuesday told the Obama administration they have serious concerns about ISIS terrorists entering the U.S. through its border with Mexico.

Sen. Chuck Grassley (R-Iowa) and Rep. Bob Goodlatte (R-Va.), chairs of the Senate and House Judiciary committees, wrote a joint letter to the Department of Homeland Security about their concerns.

The letter highlights a report from Reuters that six Syrians turned themselves in to U.S. officials in Laredo, Texas after entering the country. “Undoubtedly, others have evaded detection and succeeded in illegally entering the United States,” Grassley and Goodlatte wrote.

Grassley and Goodlatte asked the agency for a list of people apprehended at the U.S. border who come from, or recently visited, Syria, Iraq, Yemen, Sudan, Somalia, Afghanistan, or Pakistan. They also steps DHS would take if an undocumented immigrant from one of the above-listed countries were to be apprehended.

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