Story highlights Mexican President Enrique Peña Nieto condemned Republican front-runner Donald Trump

Peña Nieto's condemnation comes after months of Trump pledging to build a "massive wall"

(CNN) Mexican President Enrique Peña Nieto condemned Republican front-runner Donald Trump's rhetoric on Mexico and said that the billionaire has damaged the relationship between the U.S. and Mexico.

"Whoever insults or speaks badly of Mexico doesn't know the country," Peña Nieto told El Universal . "Whoever speaks badly of Mexicans doesn't know Mexicans."

Peña Nieto's condemnation comes after months of Trump pledging to build a "massive wall" across the U.S. southern border to keep out undocumented Mexican immigrants and he has repeatedly insisted that Mexico will pay for it.

Trump has also made the topic of Mexican immigrants a rallying call at his events, telling his supporters across the country that Mexicans are "taking our jobs" and "taking our money."

On Monday, Trump didn't address the Mexican president directly, but repeated his pledge to build a wall along the U.S. southern border.