Donald Trump proclaimed himself the presumptive GOP presidential nominee after sweeping Tuesday’s five northeastern primaries, and said he won’t change his style as the campaign goes on.

He also urged Sen. Bernard Sanders to launch an independent bid for the White House Tuesday night, saying Democrats have treated the senator badly.

“I think Bernie Sanders should run as an independent. I think he’d do great,” Mr. Trump said.

Speaking from New York as results came in from the massive victories in Connecticut, Rhode Island, Pennsylvania, Maryland and Delaware, he said his two remaining opponents should give up because they have no chance of winning, and he’s close enough that the nomination cannot be taken from him.

“It’s over. As far as I’m concerned, it’s over,” Mr. Trump said.

He mocked Sen. Ted Cruz for preparing for a contested convention in July, saying he will win the nomination on the first ballot.

He also said delegates in states such as Pennsylvania, many of whom aren’t bound to a particular candidate, should feel obligated to vote for him after he won the state so handily.

Tuesday’s victories followed a massive win the previous week in New York, and together they show the kinds of victories a clear frontrunner should be posting at this late stage.

He also credited his brash style for his victories and insisting there’s no reason for him to turn “presidential” on the campaign trail.

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