President Trump's MAGA movement is increasingly at war with itself. The central issue: a purity test over MAGA inclusion.

Why it matters: The MAGA fight, ignited by ideological differences over Israel, pulls on a lot of -isms — nativism, antisemitism, racism, sexism and Trumpism. • This is a live, all-consuming debate among powerful MAGA stars with megaphones. And it's really important: It's going to determine how powerful a strand those -isms will be in the future of MAGA and therefore Republicanism.

Zoom out: For now, MAGA is being held together by Trump's personality. But open disagreement has broken out over who should, and shouldn't, be accepted under its tent. • U.S. support for Israel's operations in Gaza inflamed America First diehards and hardened Israel's MAGA allies. The o

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