Republican presidential front-runner Donald TrumpDonald John TrumpIran claims it rejected Trump meeting requests 8 times ESPY host jokes Putin was as happy after Trump summit as Ovechkin winning Stanley Cup Russian ambassador: Trump made ‘verbal agreements’ with Putin MORE in an interview broadcast Sunday morning rejected the notion that he has to win the first-in-the-nation Iowa caucuses.

“No, I don't have to win it,” he said on CBS’s “Face the Nation.”

“I have a very substantial lead in New Hampshire. But I think it would be really good to win Iowa. I'd like to win Iowa. I'm doing really well with the evangelicals in Iowa. But I'm also doing tremendously well all over the country with the evangelicals. I'm leading by a lot. I'm doing great with the Tea Party. I'm doing well with all groups. I now have a fairly substantial lead in Iowa. I think we have a good chance of winning Iowa. I'd like to.”

Trump attributed his rise in the Hawkeye State to Ted Cruz’s undisclosed loans.

“Well, I think that Ted Cruz has been severely affected by the Goldman Sachs loans, which he didn't disclose, and it was on his personal financial form, and the Citibank loans he didn't disclose,” Trump said.

“He's supposed to be Robin Hood for everybody. He didn't disclose them, because he didn't want to say that he's dealing with the bankers. Don't forget, he said he sold his assets,” the real estate mogul added.

Trump also reiterated his line of attack against Cruz, noting the Texas senator’s birth in Canada.

“But I think much more important is this whole fact that he was born in Canada, and he was a citizen of Canada until 15 months ago,” Trump said.

“And a lot of constitutional lawyers are coming out. Laurence Tribe is sort of middle ground. In other words, he says it's untested. But there are many lawyers coming out, top constitutional lawyers, that Ted Cruz cannot run for president. He can't be president, because of the fact he was born in Canada. I think that has a huge effect.”