Vicente Fox to Trump: We won't pay for 'that f----- wall'
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Former Mexican President Vicente Fox on Friday knocked President-elect Donald TrumpDonald TrumpFormer GOP officials criticize Trump’s NATO approach Trump returns to White House after first trip abroad White House: Trump trip left no doubt 'who America’s friends are' MORE's promise to build a wall on the U.S.-Mexico border, reiterating that Mexico will not pay "for that f----- wall."

"Be clear with US tax payers. They will pay for it," Fox told Trump in a tweet.

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"Trump may ask whoever he wants, but still neither myself nor Mexico are going to pay for his racist monument," Fox tweeted earlier in the week. "Another promise he can't keep."

Reports emerged Thursday evening that Trump was coordinating with House Republican lawmakers to build the proposed wall using U.S. taxpayer dollars, despite his campaign pledge that Mexico would pay for the project.

Trump on Friday appeared to concede that American taxpayers would foot the initial bill for the wall. In a tweet blasting the "dishonest media," Trump wrote that "any money spent on building the Great Wall (for sake of speed), will be paid back by Mexico later."

Fox has long been a vocal critic of Trump, feuding with the GOP businessman and slamming his proposals involving undocumented immigrants.