Donald Trump's promise to build a massive, $8 Billion wall along the southern border of the United States - and force Mexico to pay for it - has been a staple of his stump speeches since before he even announced his candidacy. It's drawn both applause and ridicule, as well as the standard left-wing charges of racism, from day one. Now, we know what at least one former President of Mexico thinks about it.
Felipe Calderon thinks it's "stupid" and says his country will "never pay" for such a thing.