A political fault line is opening inside the Republican Party, and Israel sits directly on top of it. For decades, evangelical Christianity helped make support for Israel a pillar of conservative politics, but America First nationalism and younger Republican voters are challenging assumptions that once seemed untouchable. Polling cited in a new analysis reveals a striking generational divide that could eventually reshape Republican foreign policy. The deeper question is no longer simply whether Republicans support Israel, but how much America should be expected to sacrifice in that support.