all in the month that u.s. president donald trump tweeted the terror group defeated in syria. we have won against isis. reporter: trump s decision caught administration officials off guard. defense secretary james mattis resigned, followed short bye-bye anti-isis envoy brett mcgurk who just this month reassured allies in the region that thes would finish the job. nobody is saying that they re going to disappear. nobody is that naive. we want to stay on the ground and make sure that stability can be maintained. americans will remain on the ground after the physical defeat of the caliphate until after we are sure that those are stable. trump, who said he didn t know mcgurk, called him a grandstande grandstander. main ally against isis, syrian kurds are now abandoned,