we're going to keep seeing isis-related cases in the u.s. until we shut down the isis prop propaganda machine fueling this rapid recruitment especially of america's youth. that was the main topic among top counterterrorism officials yesterday. miningle steinbach with the fbi and intelligence chief james clapper yesterday and it's clear we have a problem with the propaganda, but the solution is not so clear. as one official said you can't just shut down the internet. during clapper's testimony he talked about the number of americans going to fight with isis and coming back. and he said the number has grown to 180 americans who have tried to join the fight and some have already returned to u.s. soil. he painted a dire picture of the current global threat. here's what he said. >> the final accounting is done 2014 will have been the most lethal year for terrorism in the 45 years that such data has been