An upstart opposition party in Hungary ousted Prime Minister Viktor Orban after 16 years in a historic election that will redefine the country’s relationship with the European Union, Russia and the U.S. administration of President Donald Trump.

Peter Magyar’s Tisza party was headed for a supermajority in parliament that will allow it to deliver on bold promises to dismantle Orban’s self-styled illiberal system. Tisza had 69% of the parliamentary mandates compared with 28% for Orban’s Fidesz, according to the Election Office in Budapest on Sunday, with 90% of the votes counted.

"Together we dismantled the Orban system,” Magyar told ecstatic supporters on a stage, with the Danube River and a lit-up parliament building behind him. "We will liberate Hungary and take back our country.”

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