Israeli Ambassador Yechiel Leiter’s public condemnation of J Street this week has garnered significant attention.

Citing the group’s support for an arms embargo on the Jewish state amid a multi-front war, the ambassador called the group a “cancer within the Jewish community” and called out its “duplicitousness” for claiming to be pro-Israel while backing policies that undermine Israel’s security.

They were blunt words. But they reflect a blunt truth: J Street is deliberately driving a wedge between the United States and Israel.

Let me start with the stakes. A new report from the Institute for National Security Studies (INSS) at Tel Aviv University outlined how American Jewish support is an essential “national security asset and is core to........

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