The protesters gathered to urge lawmakers to reject Milei’s program of harsh austerity and economic deregulation.
Argentina is in the grips of its worst economic crisis in two decades, with the annual inflation rate hitting 287 per cent in March.
To overhaul the beleaguered economy, Milei has slashed public sector wages, eliminated thousands of state jobs, frozen public works projects and and cut subsidies.
He has also devalued the nosediving peso currency by over 50 per cent, helping it stabilise but causing the prices of basic goods to skyrocket in measures that have proven brutal for the struggling lower and middle classes.