Donald Trump's presidential campaign has been a string of unfathomable sound bites ever since he announced his bid for president and unveiled plans to build a wall to stop undocumented immigrants, like Mexicans he referred to as criminals and "rapists," from entering the U.S. Since then the GOP candidate, who always boasts about his experience as a businessman, has said he'd get Mexico to pay for this great wall. Former Mexican president Felipe Calderon begs to differ, calling Trump "crazy" and the wall "stupid." 

Calderon, who served from 2006 to 2012, denounced the great wall of "stupid" to CNBC saying, "Mexican people, we are not going to pay any single cent for such a stupid wall! And it's going to be completely useless."

The former president elaborated on the wall's uselessness and explained how it'd be a foolish move for the U.S.: "The first loser of such a policy would be the United States. 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."

And then it appears Calderon realized the U.S. itself is on the crazy train saying, "It is incredible that a quite admirable society like the American society could produce such kind of candidates." Showing the poise of a former president Calderon opted to call Trump "not every well informed" hesitating to call him "ignorant." One of the things Señor Trump is not informed about is that 1 million Mexicans, which includes families and children born in the U.S. actually left the U.S. for Mexico from 2009 to 2014, reports the Pew Research Center citing the 2014 Mexican National Survey of Demographic Dynamics.

Trump, for the uninitiated, is also against refugees entering the U.S. and has called for "a total and complete shutdown of Muslims entering the United States."