BRUSSELS (AP) — An international conference of far-right politicians and supporters resumed in Brussels on Wednesday after the organizers launched a legal challenge against the authorities in the Belgian capital who feared the event could pose a threat to public order.

Hungarian Prime Minister Viktor Orban was due to speak at the National Conservative conference, a gathering of stridently nationalist and fundamentalist Christians, a day after Nigel Farage, the man credited with taking Britain out of the European Union, addressed the crowd.

French far-right figurehead Eric Zemmour had been scheduled to criticize the EU’s new migrant and asylum rules at the event Tuesday but was turned away by police. Emir Kir, mayor of the Saint-Joss neighborhood where it was held, had ordered police to prevent people from entering.

Kir acted after a group of anti-fascists threatened to disrupt the meeting. Indeed, the group had harassed conference organizers in recent days, forcing them to change venues twice. No protesters were in sight hours after police began to shut the event down but around 50 gathered after most participants had left on Tuesday.