Wilders allegedly called Islam an “ideology of war and hatred” during a 2015 speech in Vienna.
Austrian authorities have requested the Dutch government pursue a complaint on the comments.
“Islam calls people to be terrorists: the Koran leaves no doubt about it,” Wilders reportedly said.
The Austrian Freedom Party invited the Dutch Freedom Party leader to speak at an event. Tarafa Baghajati, the chairman of the Austrian Muslim Initiative, filed an official complaint shortly after Wilders’ speech.
“Wilders gave the impression that all Muslims are here to make war against Europeans,” Baghajati reportedly said. “It made me think above all of the Nazi rhetoric of the 1930s.”