WASHINGTON—Donald Trump, the presumptive U.S. Republican presidential nominee, is not all that worried that key party leaders say they won't support him in the national election against the likely Democratic nominee, former U.S. Secretary of State Hillary Clinton.

As the billionaire real estate mogul all but clinched the party's presidential nomination last week, the last two Republican presidents, George H.W. Bush and his son, George W. Bush, and numerous other party officials declared they have no intention of supporting his maverick candidacy.

"Does it have to be unified?" Trump asked about the Republican Party on ABC's This Week news show Sunday. "I'm very different than everybody else, perhaps, that's ever run for office? I actually don't think so.

"I think it would be better if it were unified, I think it would be, there would be something good about it," he said. "But I don't think it actually has to be unified in the traditional sense."

Ryan 'not ready'

The party's top current elected official, House of Representatives Speaker Paul Ryan, said he is "just not ready" to endorse Trump and wants to make sure he would uphold the party's traditional conservative principles before agreeing to support him.

Ryan has opposed Trump's call to temporarily block Muslims from entering the country and the two disagree on U.S. foreign policy and trade issues.

He and Trump have scheduled a meeting Thursday in Washington to air their differences, but the brash Trump, a one-time television reality show host who has never held elective office, said it's possible the two may just "go our separate ways."

Other conservative leaders have raised the possibility of fielding a third candidate against Trump and Clinton, but third-party candidacies have not fared well in U.S. presidential elections, almost always trailing far behind the Democratic and Republican nominees.
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