Once distant rivals in the 2024 presidential race, Ron DeSantis and Nikki Haley are now locked in a heated battle to become the most viable Republican alternative to former President Donald J. Trump, seizing on the Israel-Hamas conflict to hurl broadsides at each other.
In a flurry of mailers, online posts and media appearances this week, Mr. DeSantis, the governor of Florida, and Ms. Haley, the former governor of South Carolina and a United Nations ambassador under Mr. Trump, have feuded over their positions on U.S. humanitarian aid and accepting refugees as Israel prepares to invade Gaza.
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