Trump's provocative style
But Trump has also made quite clear he doesn't intend to cast off the provocative style on the campaign trail that alarmed the Republican establishment and resonated so deeply with primary voters. After spending days on the receiving end of criticism f-rom the likes of Ryan, Romney and Graham, Trump and his supporters hit back -- hard.
Sarah Palin, a key Trump surrogate and 2008 vice presidential nominee, took the unusual step of backing the little-known Republican businessman challenging Ryan for his Wisconsin seat.
"Paul Ryan is soon to be Cantored," Palin told Tapper Sunday on "State of the Uni-on," referring to Eric Cantor, the former Republican House majority leader who was shockingly ousted by a primary challenger in 2014. "His political career is over but for a miracle because he has so disrespected the will of the people, and as the leader of the GOP, the convention, certainly he is to remain neutral," Palin said. "And for him to already come out and say who he will not support is not a wise decision of his."
For his part, Trump didn't seem too worried about the talk of the GOP disintegrating because of his nomination. Speaking on ABC's "This Week," Trump questioned the need for party unity, arguing that his campaign is unlike any before and won't rely on the same political calculations.
"Does it have to be unified?" he asked. "I'm very different than everybody else, perhaps that's ever run for office. I actually don't think so."
He went on: "I think it would be better if it were unified. I think ... there would be something good about it. But I don't think it actually has to be unified in the traditional sense."
Those comments underscore the growing debate over whether Trump's unorthodox candidacy will doom the GOP in the fall or whether the anxious party leadership has grown so out of touch with the electorate that it's missing the genuine anger fueling Trump's rise.
'Disconnect'
"You have to draw the conclusion that there is some distance, if not a disconnect, between party leaders and members of Congress and the many voters who have se-lected Donald Trump to be the nominee of the party," John McCain, the GOP's 2008 nominee, told CNN's Manu Raju Sunday on "State of the Uni-on. "You have to listen to the people that have chosen the nominee of our Republican Party."
Trump, meanwhile, is shifting his gaze to the general election by trying to undercut Clinton's advantage with women. Facing the likelihood of running against the first female nominee of a major party, Trump sought to recast Clinton's image by reviving the impeachment saga of the 1990s and arguing that she was dismissive of women who had extramarital affairs with her husband.
"Hillary was an enabler and she treated these women horribly," Trump said Saturday in Spokane, Washington. "And some of those women were destroyed, not by (Bill Clinton), but by the way Hillary Clinton treated them after it went down."
Trump is taking a risk with such comments, and even Palin seemed to question their effectiveness. When asked by Tapper about Trump's critique of Clinton, Palin said, "a lot of people may be obsessed with a public figure's personal life, and they're going to get all entangled in, you know, past indiscretions or whatever."
"But I think, for the most part," she went on, "Americans are concerned about things like who will be able to appoint the next Supreme Court justices, which will affect an entire generation coming up. I think that's what people are concerned about, much more so than Bill Clinton's obvious indiscretions, and Donald Trump having been divorced a couple of times, but owning up to it."
Shifting positions
Trump also caused some confusion over the weekend by taking positions on the minimum wage and taxes that are not only out of step with GOP tradition but also his own stances during the primary.
On taxes, he said levies on the wealthy would go up under his administration. He argued that while he supports across-the-board tax cuts, he would likely bargain away cuts for top earners during negotiations with Congress.
"On my plan, they're doing down," he said on "This Week." "But by the time it's negotiated, they'll go up."
He added: "We're going to submit the optimum ... That's what I'd like to get and we'll fight for it. But f-rom a practical standpoint, it's going to get renegotiated. And in my opinion, the taxes for the rich will go up somewhat."
And after he told CNN's Wolf Blitzer last week that he was "looking at" raising the minimum wage, he told ABC's George Stephanopoulous that he hasn't "decided in terms of numbers."
"But I think people have to get more," he said, while acknowledging the shift.
"I'm allowed to change," he said. "You need flexibility, George, whether it's a tax plan whe-re you're going to -- whe-re you know you're going to negotiate. But we're going to come up with something."
Such shifts, however, are deeply unnerving to many of Trump's opponents. They have argued that he effectively fooled many primary voters into supporting him and will change his tune once he has to appeal to a broader electorate ahead of the general election. That fear is partly what's fueling speculation over a potential third-party run f-rom someone like Romney, who met privately with Kristol, the editor of the conservative Weekly Standard, last week to discuss how to get an independent candidate into the race.
Romney has been publicly mum about the prospect. But he clearly telegraphed his concerns about Trump in a commencement speech Saturday at Trine University in Angola, Indiana, in which he warned of "demagogues." "Profiteers tempt and endeavor to hook us with compulsive addictions," Romney said. "Entertainment media distracts us f-rom the things that bring enduring achievements and happiness."