Attempts to save Donald Trump from himself have failed, and it may be too late.
In private, Mr. Trump’s mood is often sullen and erratic, his associates say. He veers from barking at members of his staff to grumbling about how he was better off following his own instincts during the primaries and suggesting he should not have heeded their calls for change.
He broods about his souring relationship with the news media, calling Mr. Manafort several times a day to talk about specific stories. Occasionally, Mr. Trump blows off steam in bursts of boyish exuberance: At the end of a fund-raiser on Long Island last week, he playfully buzzed the crowd twice with his helicopter.
But in interviews with more than 20 Republicans who are close to Mr. Trump or in communication with his campaign, many of whom insisted on anonymity to avoid clashing with him, they described their nominee as exhausted, frustrated and still bewildered by fine points of the political process and why his incendiary approach seems to be sputtering.
He is routinely preoccupied with perceived slights, for example raging to aides after Senator Marco Rubio of Florida, in his re-election announcement, said he would stand up to the next president regardless of party. In a visit to Capitol Hill in early July, Mr. Trump bickered with two Republican senators who had not endorsed him; he needled Representative Peter T. King of New York for having taken donations from him over the years only to criticize him on television now.
And Mr. Trump has begun to acknowledge to associates and even in public that he might lose. In an interview on CNBC on Thursday, he said he was prepared to face defeat.