A preliminary hearing in a rebellion case against Catalan separatists Tuesday displayed some of the dynamics between defense and prosecutors expected during a trial that is likely to dominate Spanish politics.

Altogether, 18 former politicians and activists from the Catalonia region are charged with rebellion, sedition, disobedience and misuse of public funds for their parts in an attempt to secede from Spain last year.

At Tuesday's hearing, a panel of seven magistrates heard from defense attorneys who argued the trial should be heard by the top regional court in Catalonia rather than Spain's highest court in Madrid.

Prosecutors countered that Madrid was the proper venue, saying the events that led regional lawmakers to make a unilateral declaration of independence on Oct. 27, 2017 had ramifications outside of Catalonia.

The country's top court also has jurisdiction, prosecutors argued, because the secession attempt affected all Spaniards.