Vicente Fox to Trump: "We're not paying for that f***ing wall"

U.S. presidential runner Donald Trump said that the former President of Mexico Vicente Fox should "apologize" after using a colorful language when discussing his plan to build a wall along the U.S.-Mexico border and force Mexico to pay for it. 

"FMR PRES of Mexico, Vicente Fox horribly used the F word when discussing the wall. He must apologize! If I did that there would be a uproar!" [SIC] Trump wrote on his Twitter account.

In an interview with Jorge Ramos on Fusion, Vicente Fox called Donald Trump "a crazy guy" and said: “we're not going to pay for that fucking wall! He should pay for it. He’s got the money."

Trump's plan is to force Mexico to pay for a 1,000-mile (1,610-km), US$10 billion to US$12 billion wall along the U.S.-Mexican border.

"I will, and the wall just got 10 feet taller," Trump said in response to Fox's comments.

Just a week ago, the also former President of Mexico Felipe Calderón said that Mexico will not pay a penny for what he described as a "stupid wall."