Democrats about to take stage at first debate after picture of drowned migrants intensifies immigration fight; Source: Biden hunkered down at "Debate Camp" in Delaware; doing mock debates with Granholm as team braces for attacks

Democrats about to take stage at first debate after picture of drowned migrants intensifies immigration fight; Source: Biden hunkered down at "Debate Camp" in Delaware; doing mock debates with Granholm as team braces for attacks; New details about how father, toddler drowned at border; Report: Wife watched husband, daughter drown at the border; GOP Senator chokes up over photo of drowned migrants; Ocasio-Cortez: Mueller public testimony will add "Pressure" and "Credence" to calls for impeachment; Trump on Mueller hearings: "The Mueller thing never stops"; Trump rips federal reserve chief, says "I made him"; Trump touts TIVO ... like it's 1999

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