During the GOP debate in Manchester, New Hampshire, frontrunner Donald Trump said he'd bring back "a hell of a lot worse than waterboarding" if elected president.
Trump's comments came during a question about whether or not the practice, used to interrogate terror suspects during the Bush administration, should be considered torture.
Rival Ted Cruz said that while he believed it wasn't torture, and rather enhanced interrogation, he wouldn't bring it back in any sort of widespread use," says The Gaurdian.
"And indeed I’d join with Senator [John] McCain in prohibiting line officers from employing it," he said.
President Bush's brother, candidate Jeb Bush, said that the method was "used sparingly," but he believed laws that changed to forbid waterboarding brought the country to "the appropriate place."
Trump's comments followed months of controversial rhetoric, including a proposal to build a wall that would keep out immigrants from Mexico — a wall paid for by the country.
Former Mexican president Felipe Calderon recently blasted Trump as a "not very well-informed man."
"Mexican people, we are not going to pay any single cent for such a stupid wall! And it's going to be completely useless," Calderon said, according to CNBC.
"If this guy pretends that closing the borders to anywhere either for trade (or) for people is going to provide prosperity to the United States, he is completely crazy."