Trump: "Very concerned" about conditions on the border; 100 migrant children are returned to overcrowded facility previously called "Appalling", Trump warns of "Obliteration" in event of attacks; Iranian leader says White House has "Mental disability", House Democrats divided on border bill, but Pelosi predicts it will pass "For the children, the children, the children", Trump: "Not going to need an exit strategy" on Iran, Sources: U.S. hit Iranian-backed militia with cyberattack, targeting communications after U.S. drone was downed, Trump calls Biden "A different person than he was four or five years ago", Warren rolls out detailed policy on election security as 2020 Democrats compete for attention, New details, deep concern about missing university student
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The Situation Room with Wolf Blitzer and Pamela Brown