Large crowds gathered in front of the congress in Buenos Aires, and danced and sang when the hard-line right-wing president's veto was voted down. Similar scenes were also reported from cities such as Córdoba, Rosario, Mendoza and Mar del Plata, reports the news agency EFE.
The political struggle is currently about child healthcare and higher education. The congress voted in August to pass laws that mean more resources, and higher salaries, in child healthcare and at universities. But earlier in September, Milei imposed his veto on the laws, with the argument that they will be too expensive.
The congress can with a strong enough majority override the president's veto, and it was such votes in the lower house, the chamber of deputies, that now triggered jubilation.
The same result is also required in the senate, but Milei now has apparent headwind ahead of the midterm elections held in Argentina in October. In similar votes last week, a presidential veto was overturned for the first time since 2003.
With a chainsaw as a symbol, Milei has heavily cut Argentina's state expenditures, which has led to the first budget surplus in many years. But the cuts are met with strong popular anger.