Sanders Vows to Defeat Trump, but Leaves Clinton Hanging

Sen. Bernie Sanders of Vermont says that one of his overarching goals is to help defeat presumptive GOP presidential nominee Donald Trump this fall. Days after Clinton convincingly wrapped up her claim to the Democratic nomination with 2,800 pledged and superdelegates – 417 more than she will need at the national convention in Philadelphia next month – Sanders refuses to concede defeat or formally endorse Clinton in what is shaping up as one of the most consequential presidential con