WASHINGTON – A growing number of Republicans fear that a battery of new revelations in the far-reaching Russia investigation has dramatically heightened the legal and political danger to Donald Trump’s presidency – and threatens to consume the rest of the party as well. President Donald Trump added to the tumult Saturday by announcing the abrupt exit of his chief of staff, John Kelly, whom he sees as lacking the political judgment and finesse to steer the White House through the treacherous months to come. Trump remains headstrong in his belief that he can outsmart adversaries and weather any threats, according to advisers.