Adam Kredo writes for the Washington Free Beacon that Obama administration officials have identified an unusual reason for opposing congressional anti-terrorism efforts.

Senior Obama administration officials are expressing concern that congressional attempts to tighten laws preventing terrorists from entering the United States could violate the Iran nuclear agreement and prompt Tehran to walk away from the agreement.

Congress is considering measures that would tighten the Visa Waiver Program to make it harder for potential terrorists to legally enter the United States by increasing restrictions on individuals who have travelled to countries with prominent terrorist organizations from bypassing security checks upon entering the United States.

Iranian officials have in recent days repeatedly issued threatening statements to the Obama administration, saying that such moves would violate the nuclear agreement, and the Obama administration last week conveyed the Iranian anger to American lawmakers.

Stephen Mull, the State Department official in charge of implementing the Iran deal, warned the Senate Foreign Relations Committee late last week that these congressional efforts “could have a very negative impact on the deal.”