The National Intelligence director says cyber attacks and terrorism are the top national security challenges facing the U.S. Speaking at a Senate Intelligence Committee hearing, James Clapper said ISIS has become the pre-eminent global terrorist threat and is determined to strike in the U.S. He told the panel the wave of foreign fighters headed to conflict zones in Syria and Iraq continues to grow noting that more than 38,000 foreign fighters have traveled to Syria since 2012.  Pointing to the Paris terror attacks, Clapper said these returning foreign fighters with battlefield experience pose a dangerous operational threat.  

Clapper said the biggest cyber threats come from Russia and China.  He added that ISIS is also using cyber technology for recruitment and propaganda but has also released sensitive information about members of the U.S. military.  

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