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Changes to the visa waiver program included in the omnibus could have a "very negative impact" on the Iranian nuclear deal, the administration said on Thursday.

Congress sought to change a program that allowed citizens of many European nations to enter the U.S. without a visa amid concerns of foreign fighters from the West sympathizing with the Islamic State. Under the changes in the omnibus, which appears poised to pass the Senate, Europeans who had visited terrorist hotbeds like Iraq and Syria would have to get a visa before coming to the U.S.

Since Iran is listed as a state sponsor of terrorism by the U.S., it was also included on the list.

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