Thousands of people have turned out in Athens, to protest against the far-right Golden Dawn party.
It comes after one of its members hit a left-wing opponent during a live television debate. A warrant has been issued for the arrest of Ilias Kasidiaris.
Greece is set to go the polls again on June 17 after coalition talks failed following last month’s inconclusive elections.
European Union leaders fear further political deadlock could see the country exit the euro.