Former Mexican President Vicente Fox says his nation will not pay for Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE’s proposed border wall.

“I declare — I’m not going to pay for that f---ing wall,” he told Fusion's Jorge Ramos during an interview Thursday. "[Trump] should pay for it. He’s got the money.

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“This nation is going to fail if it goes into the hands of a crazy guy,” Fox added of the U.S. "Democracy can’t take us to crazy people that don’t know what’s going on in the world today.”

Fox said he was shocked by exit polls from the Nevada GOP presidential caucuses showing some Hispanic support for Trump.

“It worries me, this last caucus in Nevada,” he said. "[He won] 44 percent of Hispanics. I’d like to know who those Hispanics are because they’re followers of a false prophet.

“He’s going to take them to the desert,” Fox continued. "If they think they would benefit from an administration led by Donald Trump, they are wrong. Please, you Hispanics, Latinos in [the] U.S., open your eyes. It’s not to defend our race. It’s not to defend our creed. It’s to defend this very same nation that is hosting you.”

Fox added that Trump lacks any real political ideology and only represents self-promotion.

“What is Trump?” he asked. "He’s not a Republican — absolutely not. Those are not Republican principles. He’s [also] not a Democrat. He is just himself — egocentric.”

Fox is not the first Mexican leader to reject Trump's call for a border wall.

Former Mexican President Felipe Calderón said earlier this month that his nation would not pay “a single cent” for the barrier.

Trump has repeatedly insisted that as president, he will make Mexico pay for a border wall.