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Mexican President Enrique Peña Nieto has doubled down on his assertion that he told Donald Trump that his country would not pay for the Republican presidential nominee's proposed border wall.

“I repeat what I told him personally, Mr. Trump: Mexico will never pay for a wall,” Peña Nieto said in Spanish on his official Twitter account on Thursday, responding to an earlier tweet from Trump saying “Mexico will pay for the wall.”

Repito lo que le dije personalmente, Sr. Trump: México jamás pagaría por un muro. https://t.co/IJNVe0XepY — Enrique Peña Nieto (@EPN) September 1, 2016

The Twitter fight comes as the Mexican president and GOP nominee gave contradictory accounts of their meeting Wednesday, ahead of an immigration speech in which Trump recommitted to mass deportation of undocumented immigrants living in the United States.

Related: Mexico President Shares Details of Trump Meeting in Op-Ed

"We did discuss the wall; we didn't discuss payment of the wall," Trump told reporters at a press conference alongside Peña Nieto after their meeting in Mexico on Wednesday. "That will be for a later date."

But Peña Nieto later tweeted "At the start of my conversation with Donald Trump I made clear that Mexico will not pay for a wall."

"After that, the conversation moved on to other topics and unfolded in a respectful manner,” he added in another tweet.