More: In Petro's final speech before the U.N. in New York on Tuesday, he observed (according to a live translation from the U.N.) that the world is in a "different situation" than it was when he first addressed the international body in 2022.

"The old societies of Europe are collapsing," he said, "and the United States is applauding its new Hitler. It's not listening to its own young people, or its older people who died in the battlefields of Europe, fighting against Hitler and against his criminal ideology. Today, the same thing is being done as Hitler did, building concentration camps for migrants, and it's stated that migrants are of an inferior race, and they blame them just like Hitler blamed the Jews. They call them drug traffickers and thieves."

In stressing the need for climate action, Petro said of Trump: "The most powerful man in the world does not believe in science. That is irrationality. And Germany, the country of great philosophers, of Kant, Feuerbach, and others, became prey of irrationalism in 1933, and today it's this country that is becoming irrational. The solution is to stop consuming fossil fuels and to quickly switch to water, wind, hydrogen."

He also described Trump as "an accomplice to genocide" in Gaza. "This forum," he said of the U.N., "is a mute witness to a genocide, in a world where we thought that this was something only a legacy of Hitler."

"A kind of stone age," he said earlier in his remarks, has seemingly "descended on all of humankind""citing inaction on the climate crisis, Trump's strikes on "unarmed young people in the Caribbean," Israeli strikes "that have killed some 70,000 people in Gaza," and "the persecution, imprisonment, and expulsion of millions of migrants."

The Colombian president denied Trump's claim that the people on the Venezuelan boats the U.S. bombed (on shaky legal ground) earlier this month were trafficking drugs. "They said that the missiles in the Caribbean were used to stop drug trafficking," Petro said. "That is a lie."

"There should be criminal cases against those officials of the United States for doing this, including the utmost official, President Trump," he said, "that allowed the shooting of missiles against these young people who were simply trying to escape poverty""who "might have had a certain amount of drugs," he added, but "were not drug traffickers."

The U.S. mainstream media, for its part, has largely ignored his comments.