The chair of the Jewish Greens has called for Zack Polanski to step down as pressure increases on the Green leader to acknowledge anger within the party over a new policy that equates Zionism with racism and calls for the state of Israel to be abolished.

The comments by Vivien Lichtenstein come after Caroline Lucas, the Greens’ former leader and first MP, criticised Polanski for a lack of leadership in missing the debate and vote at the weekend that resulted in the policy being passed.