For generations, support for Israel united Washington. Now Israel’s attacks on Gaza, the Iran war and Prime Minister Benjamin Netanyahu’s close ties to US Republicans are eroding Democratic backing, threatening to turn one of America’s closest alliances into a partisan divide.

Support for Israel among Democratic voters has plummeted, candidates critical of Israel are winning Democratic primaries and even moderate lawmakers are increasingly willing to challenge decades of US support for Israel.

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The shift is evident in Congress. This month, nearly half of House Democrats voted for a failed amendment to cut off aid to Israel, legislation that once likely would have been defeated by an overwhelming bipartisan majority. Israel receives $3.8 billion annually in US military aid and received billions more in emergency funds in recent years.

House Democratic Leader Hakeem Jeffries and some of his lieutenants opposed the measure, calling it overly broad. But former Speaker Nancy Pelosi and House Democratic Whip Katherine Clark were among those voting yes.