Hungarian Prime Minister Viktor Orban hit out Thursday at Germany's "rude and aggressive" tone over Europe's refugee crisis and its proposals for national migrant quotas, which he has vehemently opposed.

"Today, the tone from Germany is gruff, rude and aggressive," Orban, a strident critic of Chancellor Angela Merkel's liberal refugee policy, told Bild daily, according to AFP.

"Germany's refugee policy is not without alternative," the Hungarian leader said in remarks published a day after he announced a referendum on whether to accept mandatory EU quotas for migrants.