Argentina's libertarian President Javier Milei has won decisive victories in the midterm elections, clinching a crucial vote of confidence that strengthens his ability to carry out his radical free-market experiment with billions of dollars in backing from the US administration.

In the Sunday election widely seen as a referendum on Mr Milei's past two years in office, his upstart La Libertad Avanza party scored more than 40 per cent of votes compared with 31 per cent for the left-leaning populist opposition movement, known as Peronism, exceeding analysts' projections.

Mr Milei, a key ideological ally of US President Donald Trump, said his party and allied blocs picked up 14 seats in the Senate and 64 in the lower house of Congress, bolstering the government's support in the legislature e

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