Senior party figures have criticised his response to a motion passed by members declaring Zionism a form of racism.
The Green Party has been defeated by Labour in the Holborn and St Pancras by-election. BBC Political Editor Chris Mason says questions remain for Green Party leader Zack Polanski over his position on a controversial motion passed at the party conference. The motion declared Zionism a form of racism, defining it as an ideology supporting "an ethnonationalist Jewish state".
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