The populist 5-Star Movement says it's poised to govern Italy now that Premier Matteo Renzi has announced his resignation.
The Movement, led by comic Beppe Grillo, spearheaded the winning "No"-vote campaign in a referendum on constitutional reforms.
Grillo called for an election to be called "within a week".
Luigi Di Maio, a 5-Star leader, says the vote shows "it's the citizens who run the institutions," not one man like Renzi.
Di Maio says "starting tomorrow we'll be at work on a 5-Star government."
Renzi said the reforms would have cut Italy's bureaucracy and made the country more competitive.
His opponents were hoping to tap into the populist sentiment that has been gaining ground in Europe with Brexit and in the US with the election of Donald Trump.
Another leader is toppled and the European 'establishment' now stand in terror of voters with 2017 set to host a series of big elections.
Italians go to the polls in a referendum on Sunday which could spell the end of Matteo Renzi's reign as prime minister.
Italians are preparing to vote in a pivotal referendum and one result could mean its PM resigns and send waves across the European Union.