flickers of daylight between nielsen and president trump. technology, as you know, plays a key part and we can t forget it. reporter: telling congress one of the president s prize goals, wall with mexico, isn t entirely necessary. there is no need for a wall from sea to shining sea. reporter: nielsen has clashed with president trump, who has reportedly accused her of being softer on immigration than he would like, including over the child separation policy. in may, the new york times reported that nielsen had been driven to the brink of resignation, even prompting her to draft a letter which she never submitted. if you cross the border illegally, we will prosecute you. reporter: when he reversed it, praise from the boss and a place in his good grazes for now. alex marquart, cnn, new york. ahead, dr. sanjay gupta has covered hunger crises all over the world. his powerful champions for change report he takes a look at hunger in the u.s. and the volunteers who struggle t
covered hunger crises all over the world. he takes a look at hunger in the u.s. and the volunteers who struggle to help families put food on the table.