Under fire from opposition parties, Viktor Orban said on Monday he would amend the constitution to ensure the European Union cannot settle migrants in Hungary after Sunday's referendum even though turnout was too low to make the vote valid.

The outcome deprived the maverick right-wing prime minister of a clear-cut victory with which to challenge EU migrant quotas and the radical nationalist Jobbik party called on him to quit.

Jobbik said Sunday's referendum, in which the government said quotas were rejected by 98.3 percent of voters but only 40 percent of eligible Hungarians cast a valid vote, was a fiasco that offered a "trump card" to Brussels. At least 50 percent turnout in the plebiscite was required to legitimize the result.

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