Congress will move to close loopholes that could allow Islamic State terrorists to enter the United States and conduct attacks like the one last week in Paris that killed 129 people, House Homeland Security Chairman Michael McCaul said Wednesday.

"Today we must make this much clear: We are at war," the Texas Republican said at a joint hearing with the Foreign Affairs Committee.

First on the agenda is a move to slow President Obama's plan to dramatically increase the number of Syrian refugees admitted into the United States to 10,000 by 2017 until the Department of Homeland Security, the FBI and the director of national intelligence can certify that none would be a security threat.

French authorities believe that some of those who took part in Friday's attacks in Paris sneaked into the country as refugees.

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