Donald Trump and the president of Mexico are fighting on Twitter

Donald Trump flew to Mexico yesterday for a meeting with President Enrique Peña Nieto.

After the meeting, Trump said that he and the president did not discuss the question of who would pay for Trump’s proposed wall on the US–Mexican border. Then Trump went to a rally in Phoenix where he delivered a deranged, ranty speech about the evils of immigration and reiterated that Mexico will pay for the wall. Early this morning on Twitter, he again made his point clear.

Peña Nieto, meanwhile, was under fire in Mexico for not having stood up to Trump adequately in their post-meeting press conference. But his staff put the word out that during the meeting he said Mexico would not pay for the construction of the wall, a stance he reiterated on Twitter this afternoon in reply to Trump.

This means, basically, "Repeating what I told you in person, Mr. Trump: Mexico will never pay for a wall."

To be fussy and technical about it, my view is that given the current low interest rate environment, the question of who actually finances the wall’s construction is fairly secondary. The problem with the wall, economically speaking, is that building both the wall and the necessary supporting infrastructure (much of the border passes through wilderness or desert areas that currently lack the roads you would need to ship in the components) would require an enormous amount of manpower, concrete, steel, and other construction materials.

There are some idle resources currently in the United States, but the reality is that only so many trained construction workers and so much construction equipment exists in the US. Consequently, work on the wall and the supporting infrastructure would necessarily come at the expensive of other large-scale civil engineering undertakings, whether Mexico pays for it or not.

The Republican Party’s presidential nominee and the incumbent president of Mexico are having a fight on Twitter, because this is apparently how the world works now.

Watch: Trump called Peña Nieto a friend on Wednesday

We're here to shed some clarity

One of our core beliefs here at Vox is that everyone needs and deserves access to the information that helps them understand the world, regardless of whether they can pay for a subscription. With the 2024 election on the horizon, more people are turning to us for clear and balanced explanations of the issues and policies at stake. We’re so grateful that we’re on track to hit 85,000 contributions to the Vox Contributions program before the end of the year, which in turn helps us keep this work free. We need to add 2,500 contributions this month to hit that goal. Will you make a contribution today to help us hit this goal and support our policy coverage? Any amount helps.

One-Time Monthly Annual

$5/month

$10/month

$25/month

$50/month

Other

$

Yes, I'll give $5/month

Yes, I'll give $5/month

We accept credit card, Apple Pay, and Google Pay. You can also contribute via