Ret. Lt. Col: Trump is a 'potent destructive force'

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More than 60 ex-CIA officials have issued a statement condemning Trump’s revocation of former CIA Director John Brennan’s security clearance, as Trump defends the move saying he’s “gotten tremendous response” and pivots to the “rigged” Russia “witch hunt.” Retired Army Lieutenant Colonel Ralph Peters, Former Acting Assistant Attorney General Mary McCord, Howard Fineman and Christina Greer join Ari Melber.