Former Mexican President Vicente Fox slammed President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE in a new op-ed Monday, claiming that Trump has killed the American dream.

“It has been more than a year since Donald Trump was elected, and since then he has tweeted more policies and complaints than any other political leader,” Fox wrote in an op-ed for Newsweek. “He has put international relations at risk and ended the American dream for hundreds of thousands of Americans and non-Americans. Is there anything he hasn’t done?”

The frequent Trump critic blasted the president for his threats on Twitter, including his recent suggestion that immigration enforcement from Mexico could become a condition in the ongoing North American Free Trade Agreement negotiations.

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“Today we continue renegotiating the treaty because of good old Donald’s whims, we keep listening to him whining, and reading his conditions on Twitter; the most recent one is that the Dreamers depend on the construction of the f---ing wall,” Fox wrote.

He also ripped Trump for tweeting about the “caravan” of immigrants heading to the U.S. border through Mexico, claiming that Trump saw reports of the caravan on TV and turned “it into a horror story.”

Still, Fox said that he thanks Trump for uniting Mexican leaders and politicians to oppose Trump’s policies.

“We still have many challenges ahead, but knowing that Mexico makes itself heard in one voice is enough that they won't mess with us. Trump must understand that Mexico might be small in comparison, but we are mighty,” the former Mexican leader wrote.

Fox has criticized Trump since the 2016 campaign, largely over Trump's immigration policies and push to build a wall on the U.S.-Mexico border.