Erdogan has accused the pro-Kurdish HDP, parliament's third-biggest party, of being the political wing of militants who have waged a three-decade insurgency in Turkey's largely Kurdish southeast, and wants to see them prosecuted, Reuters reports.
The HDP denies such links and says its parliamentary presence could be all but wiped out if prosecutions go ahead.
"They will have to arrest us, take us by force. We will resort to all possible measures to challenge the decision, including taking it to the constitutional court," the party's co-leader Selahattin Demirtas told reporters outside parliament.
Read alsoErdogan slams EU visa freedom benchmark on terrorErdogan on Friday stressed his support for the bill, which will become law once approved by him and published, paving the way for the launch of judicial proceedings.
"My nation does not want to see guilty lawmakers in this country's parliament. Above all it does not want to see those supported by the separatist terror group in parliament," he told a crowd in the Black Sea town of Rize, referring to the outlawed Kurdistan Workers Party (PKK) militant group.
