Bloomberg and Sanders spar ahead of ex-mayor's first debate; Source: Trump and Barr "cooling off" after attorney general signals he may resign over Trump's tweets; Sanders: Bloomberg doesn't have "Right to buy election"; Sanders facing questions over withholding full medical records, despite heart attack; Sanders aide apologies after falsely claiming Bloomberg had a heart attack; Lawyer for Wikileaks' Assange claims Trump offered pardon in exchange for help with Russia investigation; Top Pentagon policy official who warned against withholding Ukraine aid resigns at Trump's request; CNN Poll of Polls: Sanders well ahead of 2020 rivals; Bloomberg and Sanders spar ahead of ex-mayor's first debate; Sanders refuses to release more medical records; Japan criticized as coronavirus spreads on quarantine ship;
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The Situation Room with Wolf Blitzer and Pamela Brown