Hungary's populist strongman Viktor Orban was banking on voters Sunday to defy the European Union and reject its troubled refugee quota plan, but low turnout threatened to taint his camp's expected referendum win.

Surveys showed the referendum turnout might not reach the required 50-percent threshold and therefore be deemed invalid.

But Orban has already downplayed the political significance of the eventual turnout and said there would be "legal consequences" regardless of the outcome.

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