One of Donald Trump’s frequent talking points is that he’ll build a “big, beautiful wall” along the entire US border with Mexico, to stop “rapists and criminals and drug dealers” from coming into the country. And when asked how he intends to pay for such an absurdly gigantic project, he says don’t worry — Mexico is going to pay for it.

Lately in his stump speeches, Trump has taken to asking the crowd, “Who’s going to pay for the wall?” And the right wing audience shouts in response, “MEXICO!”

Well, in an interview with CNBC over the weekend, former Mexican President Felipe Calderon minced no words expressing his opinion about this bigoted, ridiculous idea: Mexico ‘won’t pay single cent for Trump’s stupid wall.’

“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.

“The first loser of such a policy would be the United States,” he said. “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.”

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Calderon questioned the caliber of candidates like Trump, who has offended large sections of the population , including Muslims by calling for a temporary ban on Muslims entering the U.S., as well as attracting a large following during his presidential bid.

“It is incredible that a quite admirable society like the American society could produce such kind of candidates,” Calderon said. “I cannot understand that. No offense, no offense to America. So Donald Trump … is ambitious but not exactly very well-informed man, I don’t want to say ignorant, but he is not very well informed.”