Former Mexican President Vicente Fox on Saturday slammed President Trump over his feud with The New York Times, telling him it's time to "start being presidential."

"Donald, you're a president. Behave like one. These rants are child play. Quit twitter, start being presidential," Fox tweeted alongside a tweet from Trump hitting the Times for being "fake news."

Donald, you're a president. Behave like one. These rants are child play. Quit twitter, start being presidential. https://t.co/Jv1w6ceQiM — Vicente Fox Quesada (@VicenteFoxQue) February 4, 2017

Fox has been an outspoken critic of Trump and has condemned his proposal to build a wall with Mexico multiple times.

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In January, Fox told the president that Mexico would not pay "for that f--king wall."

"Be clear with US tax payers. They will pay for it," Fox told Trump in a tweet.

Fox has feuded with the president, slamming his proposals involving undocumented immigrants since he was on the campaign trail.