Colombia is expelling a number of Argentine diplomats in response to the insults President Javier Miley made against his Colombian counterpart.
In an interview with CNN, the Argentine leader called Gustavo Petro, the president of Colombia, a "murderer terrorist".
He also said that the Mexican president is "ignorant".
The president of Argentina has become notorious for his harsh rhetoric and 'long' language.
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While personal attacks are not uncommon in Latin American politics, Milei surprised many when he attacked Pope Francis last year, calling him "an imbecile who defends social justice."
While the head of the Roman Catholic Church dismissed the remarks, embracing the Argentine leader during a meeting in the Vatican, Latin American politicians were not so forthcoming.
The CNN interview that caused the latest uproar will air on Sunday, but the channel has released several clips ahead of the show.
In one of them, Miley suggests that Colombia under leftist President Petro could collapse and "look like Venezuela and Cuba."
"There's carnage in Venezuela, it's really unprecedented, just like on that prison island, Cuba," he told CNN.
"And there are others that are going that way, like Colombia with Mr. Petra," he added.
“Well, you can't expect much from someone who was a terrorist-murderer, can you?” Milei asks, apparently referring to Peter's past as a former rebel fighter.
In the 1980s, the Colombian president was a member of the former guerrilla group M-19.
During the war against the Colombian state, the group stormed the Palace of Justice in the Colombian capital Bogota in 1985 and held more than 300 people hostage.
Security forces surrounded the building and more than 100 people died in the ensuing battle to rid the building of M-19s.
The incident is also known in Colombia as "28 hours of terror".
But while he was a member of the guerrilla group M-19, Petro did not participate in the attack on the Palace of Justice.
He was then in prison for belonging to a group.
The Colombian leader has never hidden his past in the M-19, a group that was demobilized more than three decades ago.
As the first left-wing president of Colombia, he faces a lot of criticism at home, but Miley's comment, in this Andean country, caused widespread indignation among many.
The Ministry of Foreign Affairs announced that Milei had violated the "dignity" of President Petr, and that they would expel a number of Argentine diplomats, without specifying how many.
In Mexico, the two candidates vying to replace President Andres Manuel Lopez Obrador in June's elections have also come to his defense.
They demanded that the Argentine leader treat Lopez Obrador with respect since Miley said in an interview with CNN that he was flattered by the fact that the "ignorant" Mexican president spoke ill of him.
López Obrador has labeled Miley in the past as a "fascist ultra-conservative".
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