WASHINGTON - US President Donald Trump issued a stark warning to Colombian President Gustavo Petro Sunday night, saying Petro "is not going to be doing it for very long".

When asked about the possibility of a US military operation against Colombia, Trump replied, "It sounds good to me."

Colombia, which borders Venezuela, is "run by a sick man who likes making cocaine and selling it to the United States", Trump told reporters on Air Force One.

"He (Petro) has cocaine mills and cocaine factories. He's not going to be doing it," said Trump, offering no evidence to substantiate the claim.

Petro on Saturday called for an urgent meeting of the Organization of American States and the United Nations to address the US attack on Venezuela.

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In an interview with Politico last month, Trump said he would consider extending military operations against targets in other countries, including Mexico and Colombia.