Hungary is expected to overwhelmingly reject the European Union's migrant quotas in a referendum.
On Sunday, Hungarians will go to the polls and have their say whether the EU is "entitled" to proscribe a mandatory migrant quota.
The question will read: "Do you want the European Union to be entitled to proscribe the mandatory settlement of non-Hungarian citizens in Hungary without the consent of the National Assembly (Parliament)?"
A convincing majority are expected to reject the quota.
Such a move would boost Prime Minister Viktor Orban's standing at home and embolden him in his battle with Brussels.
Orban, who has been in power since 2010, is among the toughest opponents of immigration in the EU.
Over the past year, Hungary has seen its southern border sealed with a razor wire fence and thousands of army and police border controls.
In that time it has recorded around 18,000 illegal border crossings as the numbers of migrants fleeing war and poverty has swelled.
In a letter published in a newspaper on Saturday, Orban urged Hungarians to send a message to the EU that its migration policies were flawed and posed a threat to Europe's security.
"We can send the message that it is only up to us, European citizens, whether we can jointly force the Union to come to its senses or let it destroy itself," Orban wrote.
Opinion polls show support for a rejection of EU migrant quotas to be higher than 80%.
At least 50% of the voting population is required to turn out for the poll to be valid.