we were used to prior to the iraq war and prior to the obama era, which was what you would call proportional response. you blow up the marine barracks, we shell the valley. you bomb a disco tech, we do air raids. this was right out of the bill clinton play book. lobbing tomahawk missiles and using that to blow up bad guys in foreign countries was cruise missile diplomacy become a thing for bill clinton. we are seeing the way trump reverted to the norm for american presidents in the past, prior to 2001, which is this sort of proportional limited response. it's popular. unpopular is putting troops on the ground or a deeper commitment. >> the commander in chief has a ton of decisions to make. all the problems of the world land right on his desk. thank you. >> yes, ma'am. >> dana: the pentagon ramping up pressure against north korea. stepping up action by sea and air. uss carl vinson moving toward the peninsula. senior foreign affairs correspondent greg palcott is in seoul, south korea. what can you say? >> reporter: hi, dana. that's right. north of the border, north of the dmz, lot of provocations coming out of the government of kim ju