Then-Rep. Marjorie Taylor Greene, R-Ga., puts on her "Make America Great Again" hat while addressing a campaign rally for then-candidate Donald Trump in March 2024 in Rome, Georgia. After Trump ordered strikes on Iran in recent days, Greene sharply criticized the president for abandoning an "America First" foreign policy and his promises of "no new wars." Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images

The Trump administration's justification for war in Iran is exacerbating tensions within the president's political coalition and highlights an increasing disagreement on what "America First" means.

In the hours after the U.S. and Israel launched attacks that killed Iran's supreme leader, Ayatollah Ali Khamenei , and that have led to an ongoing conflict that has seen the deaths of six U.S.…