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 Trump added to the tumult Saturday by announcing the abrupt exit of his chief of staff, John F. 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. In the Russia probe, he continues to roar denials, dubiously proclaiming that the latest allegations of wrongdoing by his former associates "totally clear" him.

But anxiety is spiking among Republican allies, who complain that Trump and the White House have no real plan for dealing with the Russia crisis while confronting a host of other troubles at home and abroad.