"I consider myself the presumptive nominee," Trump said during his victory press conference tonight.
"This is a far bigger win than we expected," he added.
"This one's a diverse victory.... Every one of them is conclusive and every state is so different," Trump said of his projected victories in Connecticut, Delaware, Maryland, Pennsylvania and Rhode Island.
"When you crack 60 [percent] with three people, that's very hard to do," Trump said.
"The Republican Party needs something very different," Trump said.
Trump also took on his possible Democratic rival, Hillary Clinton, saying that she "has nothing else going" besides being a woman.
"I think the only card she has is the woman's card. She has nothing else going. Frankly, if Hillary Clinton were a man, I don't think she would get 5 percent of the vote. The only thing she has got going is the woman's card," he said. "The beautiful thing is, women don't like her. Look how well I did with women tonight."
ABC News' John Santucci contributed to this report.