Vivien Lichtenstein says she believes motion is unhelpful as anger grows over Zack Polanski’s absence for voteUK politics live – latest updatesThe head of the Jewish Greens has said she may leave the party after it voted to adopt a policy that equates Zionism with racism and calls for Israel to be replaced by a single Palestinian state.Vivien Lichtenstein said that while opinion among Jewish members of the party was split on the motion passed at its annual conference in Brighton on Sunday, she s