President Obama took a direct shot at Donald Trump Friday by arguing that a constructive relationship with Mexico is much more effective than building a wall between the two countries.

“Mexico has been a consistent, strong partner with us” on the issue of illegal migration and combating drug trafficking, Obama said during a press conference with Mexican President Enrique Pena Nieto Friday at the White House. “And if they had not been, we would have had much worse issues on the border.”