Seems the issue was Mexico paying for the border wall, the one that both Peña Nieto and his predecessor, Vicente Fox, made quite clear was not going to happen.
Mexican President Cancels Trip To Washington After Heated Call With Donald Trump
We have to give Trump credit for perseverance anyway. Once he gets his teeth into an issue like Mexico paying for a border wall, he doesn't let go.
Mexican President Cancels Trip To Washington After Heated Call With Donald Trump
The president of Mexico halted upcoming plans to visit the White House after a reportedly tense phone conversation with President Donald Trump, according to the Washington Post.
U.S. and Mexican officials told the Post that President Enrique Peña Nieto called off his visit to Washington D.C. after Trump refused his request to publicly affirm Mexico’s ongoing stance that the country will not pay for a border wall between the two countries during a phone call on Tuesday.
We have to give Trump credit for perseverance anyway. Once he gets his teeth into an issue like Mexico paying for a border wall, he doesn't let go.