Assorted radical leftist groups announced Monday they plan to sue Foreign Minister Avigdor Lieberman for libel after he called them "terror groups" Sunday.
The organizations Adalah, Yesh Din, and Breaking the Silence wrote Lieberman saying, "Your comments constitute mendacious, wild, and thuggish incitement which you dreamed up."
The letter comes as tensions ratchet up between Leiberman and Prime Minister Binyamin Netanyahu, who has refused to back a commission to probe sources of funding of radical leftist groups under a law requiring full financial disclosure by NGOs.
Several ostensibly Israeli NGO's are known to be underwritten by foreign government's and organizations, leading many to view them as not Israeli at all.
"These are not left-wing and human rights organizations, but terror groups and terror supporters," Lieberman said Sunday.
"All those Adalah, Yesh Din, Breaking the Silence, which provide distorted information, are part of the de-legitimization; all those Marmara activists, who disrupted the IDF's efforts to defend Israel, who handed the names of IDF officers and soldiers to courts across the world and helped Hezbollah with espionage operations."
The organizations are being represented by Attorney Michael Sfard, who responded to the foreign minister's claims.
Lieberman's office refused comment on the letter, saying "it isn't necessary to respond to anyone."
But sources close to the foreign minister say the suit is an attempts to 'de-legitimize' his Yisrael Beiteinu party.