ISIS has overtaken Al Qaeda as the leader of the global violent extremist movement and has access to a large pool of potential recruits in Western countries, according to U.S. national counter-terrorism center chief Nick Rasmussen.

Catherine Herridge reported on "On The Record" that ISIS has surpassed Al Qaeda because it has been able to seize territory in Syria and Iraq and hold it.

Herridge said that ISIS is telling potential recruits to come to the Middle East and join the caliphate, or stay in their home country and target military members or law enforcement officers.

She added that Rasmussen also testified at a hearing Thursday that the threat of radical Islamic terror is more diverse, more widespread and involves more individuals globally than they've seen at any time in the past 14 years.

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