"Trump just failed his first foreign test. Diplomacy isn't as easy as it looks," said 68-year-old Clinton in a tweet.

Trump, 70, has almost no experience in foreign policy as compared to Clinton who served as the US Secretary of State during the first term of the Obama Administration. Clinton's critical comment came after a controversy erupted on building a wall along the Mexico border, a major election plank of Trump.

The Mexican President tweeted that during the meeting he told Trump that Mexico would not pay for the wall. However, Trump said that he never discussed this with the Mexican president. The Hillary Campaign slammed Trump for visiting Mexico to meet its president at his invitation.

"Donald Trump has made his outlandish policy of forcing Mexico to pay for his giant wall the centerpiece of his campaign. But at the first opportunity to make good on his offensive campaign promises, Trump choked," said John Podesta from Hillary for America Chair.

However, the Trump campaign defended the decision to travel to Mexico.

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