The Clinton Campaign today slammed Republican presidential nominee Donald Trump for his decision to visit Mexico City and meet Mexican president Pena Nieto ahead of his long-awaited speech on immigration.

"What ultimately matters is what Donald Trump says to voters in Arizona, not Mexico, and whether he remains committed to the splitting up of families and deportation of millions," said Jennifer Palmieri, communications director of the Hillary Campaign.

Trump earlier announced that he would travel to Mexico today to meet with the Mexican president.

"I have accepted the invitation of President Enrique Pena Nieto, of Mexico, and look very much forward to meeting him tomorrow," Trump tweeted. 

Soon after, the Mexican President tweeted that Trump has accepted his invitation.