Republican presidential nominee Donald Trump arrives in Mexico to meet Enrique Pena Nieto, AFP quoted an airport official as saying.

President Nieto, who once compared Trump with Hitler, is facing a storm of criticism from Mexicans over his decision to meet the real estate mogul.

Former Mexican first lady Margarita Zavala, wife of ex-president Felipe Calderon and herself a potential presidential candidate, aimed a tweet at Trump, saying: Even though you may have been invited, we want you to know you're not welcome. We Mexicans have dignity, and we reject your hate speech.

Many Mexicans felt the Republican candidate had left Pena Nieto flat-footed by accepting an invitation the Mexican president had made simply for appearances sake.