few months ago and joined isis and when the kurds asked where he had been he answered -- >> reporter: mosul, now an isis stronghold in iraq. last week, this man who said he's an isis defector, provided nbc news with a cache of he stole from the group. foreign fighters have to obtain permission to leave with each request carefully logged in these forms. isis may be starting to lose its grip on its territory. last week a u.s. official said isis had retreated from 1,000 square miles. information and today's bizarre desertion show that isis may be cracking under the pressure from its many enemies. a u.s. law enforcement official said quase was apparently not not a u.s. database of suspected isis members who have traveled overseas. in other words, they didn't know he had gone to fight with isis until he got caught trying to sneak out. lester? >> richard engel, tonight. >>> a surprise announcement today from russian president vladimir putin who says he's withdrawing most of russian troops from syria charging their mission has been accomplished. putin sent forces in in october with a stated priori
three others were injured in the attack south of mosul. it was fired at a small outpost. iraqi troops are preparing for an assault on mosul, a large city that has been held by isis for almost two years. >>> two americans were killed, at least among the four people in a suicide bomb attack in turkey today. it happened in istanbul in the middle of a shopping district. last week, another attack left 35 people dead in the capital. three dozen people were injured in today's explosion. campaign heated up today in arizona as the republican front runner campaigned in that state which holds its primary tuesday. immigration is a key issue. the latest tonight in hallie jackson in arizona. >> reporter: stopping traffic, hoping to stop trump, protesters filled this phoenix street. and arrests, arguments. again, after these angry scenes in salt lake city last night. his supporters line up for trump's rallies in arizona, ground zero for the political immigration. today, trump appearing with the governor and and a sheriff. >> this country has a big, big problem with illegal immigration.
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