Former Mexican President Vicente Fox stunned Fox Business Network anchor Maria Bartiromo on Friday morning when he repeated his declaration that Mexico is “not going to pay for that fucking wall” on live television.

The wall in question is Donald Trump’s plan to prevent illegal immigration at the southern U.S. border. On Thursday, Fox said Mexico will not pay for Trump’s “fucking wall.” When asked about Fox’s comments at the Republican presidential debate later that night, Trump said the wall “just got ten feet taller.”

Bartiromo asked Fox if he thought his comments would bolster Trump. The former president replied that Trump needed to re-evaluate which countries he was talking about.

“He’s talking about the two largest trading partners of the United States. He’s not talking peanuts. China and Mexico are the two largest trading partners,” he said.

Bartiromo argued Trump thinks “he going to be successful” because of that symbiotic relationship. Fox wasn’t impressed.

“I have to say we’re not, I am not, I am not going to pay that fucking wall,” he said. “I am not. He should know that, and I’m not going to apologize.”

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