BUENOS AIRES (Reuters) -Argentina's firebrand right-wing President Javier Milei has largely tamed runaway inflation with a ruthless austerity plan and he aims to solidify power when his party and its allies take on a divided opposition in legislative elections in October. The trash-tweeting, shaggy-haired economist, who famously handed tech billionaire Elon Musk a chainsaw at an event in Washington earlier this year, has overseen a steady dollar-peso peg but relies on legislative allies in Congress to pass his agenda. Many of the changes he has implemented have been through presidential decrees, like his ideological ally, U.S. President Donald Trump, who called Milei his favorite president.