Ilias Kasidiaris, a spokesman for Golden Dawn candidate Chrysi Avgi, apparently threw water at SYRIZA's Rena Dourou, then slapped Communist Party hopeful Liana Kanelli multiple times during a political debate on ANT-1 TV, ekathimerini.com reported.
The debate turned into a physical fight after Kasidiaris and Kanelli disagreed over whether there were oil reserves south of Crete. The show went off air when Kasidiaris hit Kanelli, but there were some reports that the scuffle continued off camera.
Prosecutors issued a warrant for Kasidiaris' arrest shortly after the incident.
Kanelli said that Kasidiaris' behavior is proof that those who supported neo-Nazi Chrysi Avgi on May 6 should withdraw their support in the June 17 election.
"With the power of their vote on June 17, citizens must isolate every thuggish hand, which has no qualms about striking at any time," said Kanelli.
Kasidiaris also has been accused of complicity in the mugging of an Athens University student in 2007 and is scheduled to go on trial in that case Monday.