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

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