The South American nation says it is considering withdrawing from the landmark agreement, which aims to limit carbon emissions and slow global warming.
Last month Milei attended a far-right rally in Madrid, which worsened relations between him and Spain's socialist Prime Minister Pedro Sánchez.
The populist president has made plans to dramatically slash spending and boost his own powers, and has met with public outcry.
Relations between Spain and Argentina are said to be at their historical lowest after Argentina's populist president Javier Milei hurled accusations at Spain's PM Pedro Sánchez...