Celebrating his big win in Indiana—and his elevation to presumptive nominee of the Republican Party—Tuesday night, Donald Trump spoke at Trump Tower in New York City, where he delivered a promise to heal the deep fractures in his party.

“We want to bring unity to the Republican Party,” he said. “We have to bring unity. It's so much easier if we have it.”

That will be a tall order. But as a general-election candidate, Trump will need to win over more than just Republicans. In his inimitable way, he pledged to bring together the rest of the nation as well.

“We're going to bring back our jobs, and we're going to save our jobs, and people are going to have great jobs again, and this country, which is very, very divided in so many different ways, is going to become one beautiful loving country, and we're going to love each other, we're going to cherish each other and take care of each other, and we're going to have great economic development and we're not going to let other countries take it away from us, because that's what's been happening for far too many years and we're not going to do it anymore,” he said. (That’s a single sentence, if you’re keeping track at home.)

Trump faces significant obstacles to achieving that unity, particular with blocs that are not white men. Seven in 10 women view him unfavorably. It’s even worse with minorities. A recent Gallup poll found that 77 percent of Hispanics view Trump unfavorably. A Washington Post poll pegged that number at eight in 10, seven of them “very unfavorable.” An NBC News/Survey Monkey poll found an astonishing 86 percent of African Americans had a negative view of Trump.