Donald Trump is his own chief strategist and campaign spokesman. So what could go wrong?

Everything was supposed to change once Donald Trump became the GOP’s presumptive presidential nominee.

He would stop with the barking and bickering and racist comments, hunker down in the dozen or so states deemed likely to decide the November election, and go on the sort of hiring and campaign-building spree that, history suggests, a candidate needs to seriously vie for the White House.

But the Manhattan business executive and reality TV star continues to defy expectations.

Rather than seek to unite the party, he keeps picking fights with fellow Republicans. He let go the strategist he had hired to expand his team in battleground states and devoted several days to campaigning across California, which he vows to contest in the fall — along with strongly Democratic New York — despite vanishingly small odds of success.