Republican presidential front-runner Donald TrumpDonald John TrumpLev Parnas implicates Rick Perry, says Giuliani had him pressure Ukraine to announce Biden probe Saudi Arabia paid 0 million for cost of US troops in area Parnas claims ex-Trump attorney visited him in jail, asked him to sacrifice himself for president MORE on Sunday reiterated his argument that rival Ted CruzRafael (Ted) Edward CruzSeven things to know about the Trump trial All the frontrunners could survive initial Iowa test Republicans face internal brawl over impeachment witnesses MORE can't be president because he wasn’t born in this country.

“He was born in Canada folks. He was born in Canada,” Trump said during a rally in Indiana on Sunday.

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“No. 1, he can’t win, he’s got no path to win. And if he had a path to win, which he doesn’t, he has very few votes and he has very few delegates, but, I’ve been saying, he wasn’t born in this country.”

Cruz’s wife, Heidi Cruz, referred to her husband as an immigrant during an Indiana campaign stop on Saturday.

"Ted is an immigrant," Heidi Cruz said. "He is Hispanic. We can unify this party."

The Cruz campaign later said Heidi Cruz misspoke. She meant to call her husband the son of an immigrant.

But Trump used the mistake to again make the argument that Cruz can't be president.

“His wife just said, 'My husband is an immigrant,'” Trump said Sunday.

“And I said, when I heard it, 'That’s what I’ve been saying.'”

Trump said if Cruz were to get the nomination, the first thing the Democrats would do would be to bring a lawsuit against the Texas senator “saying he’s not a naturalized citizen.”

“I’ve had the biggest, the best lawyers in the world tell me, you can’t run.”

“Now, the Democrats are sitting back with one of the best lawyers in the world. If Cruz ever got lucky, and he can’t, but if he ever got lucky and got the nomination, he will be sued immediately. He won’t be allowed to run,” Trump said.