Trump brags about crowd size while visiting El Paso after shooting, mocks "Crazy Beto" O'Rourke; Exclusive: El Paso suspect's mom called police about son's gun; New Iowa poll: Biden keeping lead, Warren surging, Sanders falling

Trump posts political-ad style video of visit to El Paso hospital set to triumphant soundtrack; Source: White House rebuffed attempts by DHS to make combating domestic terrorism a higher priority; Sources: House Judiciary considering coming back from recess to work on gun legislation; Dayton gunman's friend: I saw him physically abuse his sister; Crying children left without parents after immigration raids; Sources: Acting DHS Secretary was prepared to resign; Inside the power struggle at the homeland security dept; Dems descend on Iowa, Biden, & Bullock give state fair stump speeches; Six months before caucuses, Dems make pitches to Iowa voters; New Iowa poll: Biden keeps lead at 28%, Warren surges to 19%, Sanders falls to 9%; Harris rolls out first TV ad of campaign in Iowa; Report: Climate crisis threatens worldwide food supply;To learn more about how CNN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices