Zack Polanski faces internal pressure after losing the Holborn and St Pancras by-election to Labour on 8 October 2026, finishing second with 33 percent of the vote amid a swing toward the Greens. The result followed a divisive party conference motion declaring Zionism a form of racism, which members narrowly approved while Polanski was campaigning and missed the debate and vote. Senior figures including the chair of Jewish Greens and former leader Caroline Lucas criticized his absence and leadership, prompting public calls for resignation and polling showing roughly one-third of voters favoring his departure. Polanski has rejected stepping down, stating the next scheduled leadership election in summer 2027 will decide his future and emphasizing member support for continuing. These events have heightened short-term scrutiny of his position despite the fixed two-year term structure.