Donald Trump's proposal to build a wall along the United States-Mexico border received a straight forward response from one of the Central American country's former leaders and he did not like it.

Former president Vicente Fox Quesada bluntly stated that he would never pay for the border wall the Republican presidential frontrunner wants, per a report from Fusion.

During an interview with Univision anchor Jorge Ramos, Fox strongly declared that he is "not going to pay for that f---ing wall," referring to Trump's proposed border wall.

In response to these strong words, Trump took to Twitter to demand an apology from the former president.

In the interview, the former Mexican president also expressed his surprise at how the investor mogul-turned-politician performed during the Nevada caucus, saying that he wants to know who comprised that 44 percent, whom he believes are making a big mistake by following "a false prophet."

Furthermore, he called for better judgment among Latinos who would join the November 2016 Elections in the United States, asking them not to hand over the nation to "the hands of a crazy guy."

"Please, you Hispanics, Latinos in the U.S., open your eyes. It's not to defend our race. Not to defend our creed. It's to defend this very same nation that is hosting you. This nation is going to fail if it goes into the hands of a crazy guy," he said.

When talking with CNN, Fox condemned how Trump handled minorities, adding that the Republican candidate reminded him of the notorious dictator Adolf Hitler.

"Today, he's going to take that nation (U.S.) back to the old days of conflict, war and everything ... He has offended Mexico, Mexicans, (and) immigrants. He has offended the Pope. He has offended the Chinese. He's offended everybody," he said.

Since he began this political race, Trump had been subject to strong criticism, particularly from Hispanics.

In fact, another Mexican leader, Felipe Calderon, had previously declared that no Mexican would pay for Trump's proposed border wall and called him 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 told CNBC early in February.

He further noted that such policy would not benefit the United States considering that his proposal not only closes off the nation from illegal immigration but also from other inter-nation relations, including product trade.