Spain on Monday demanded a "public apology" from Argentina's President Javier Milei for calling Spanish Prime Minister Pedro Sanchez's wife "corrupt" amid a deepening diplomatic crisis between the Hispanic allies.
Spain's socialist government has already recalled its ambassador to Buenos Aires and the two leaders sparred over the comments made to a conference of far-right leaders in Madrid.
Foreign Minister Jose Manuel Albares said he would summon the Argentine ambassador on Monday "to explain to him the gravity of the situation and I am going to demand again a public apology by Javier Milei."
Albares said he would not exclude the possibility of rupturing diplomatic ties with Argentina. "We clearly do not want to take these measures but if there is no public apology, we will do it," the minister said.
The Spanish prime minister accused Milei of not being "worthy" of the countries' "fraternal bonds", in his first comments on the row. "I am fully aware that the person who spoke yesterday did not do so in the name of the great Argentine people," he added, saying he had asked Milei for a "rectification" of his comments.
The tub-thumping conservative Argentinian leader showed no regrets in his response on X, the former Twitter. "The lion is back and surfing on the waves of the socialist tears," he said. "Long live liberty".
"There is no apology to make," said Argentina's Interior Minister Guillermo Francos. "I think, on the contrary, it is for the Spanish government to make an apology for what has been said about Milei," he told the TN television channel.
Milei caused outrage at a Madrid conference organised by Spain's far-right Vox party. He lashed out at socialism and attacked Sanchez's wife, Begona Gomez, without naming her.
"The global elites don't realise how destructive it can be to implement the ideas of socialism," Milei said.
"They don't know the type of society and country that can produce, the type of people clinging to power and the level of abuse that generates."
He added: "When you have a corrupt wife, let's say, it gets dirty, and you take five days to think about it."
Sanchez recently considered resigning after Spanish prosecutors opened a preliminary corruption investigation against his wife, which was quickly closed.
Within hours of Milei's attack, Spain recalled its ambassador and Albares slammed the visiting president's "insult". The European Union's foreign affairs chief Josep Borrell also condemned Milei's latest remarks.
Milei arrived in Spain on Friday and there was immediate diplomatic friction as no meetings with Sanchez or King Felipe VI were organised during his stay. During a speech on his first day, Milei denounced what he called "satanic" socialism.
The two governments have seen weeks of mounting tensions that are starting to worry Spanish companies that invest $15 billion a year in Argentina.
Last month, a Spanish minister hinted that Milei took drugs. In response, Milei's office said Sanchez had brought his country only "poverty" and "death".
Spanish companies are the second largest investors in Argentina behind US enterprises. The CEOE business federation chief, Antonio Garamendi, said Milei's attack could "damage" exchanges.
Milei, a self-declared "anarcho-capitalist", won elections last November and took office vowing to reduce Argentina's vast public debt to zero.
He has instituted an austerity programme that has seen the government slash subsidies for transport, fuel and energy.
Milei was one of a host of European far-right and conservative leaders to speak at the Madrid conference.
Marine Le Pen, France's far-right standard bearer, spoke at the event while Hungary's Prime Minister Viktor Orban and Italy's Prime Minister Giorgia Meloni sent video messages.
