TEL AVIV, July 8 - Rahm Emanuel, a Democrat weighing a 2028 U.S. presidential run, said on Wednesday that Israel risks jeopardizing its alliance with Washington unless it changes course on the Palestinians because of growing unease with its policies among U.S. voters.

A former Chicago mayor and chief of staff to former President Barack Obama, Emanuel used a speech at Tel Aviv University to criticize Prime Minister Benjamin Netanyahu's government and propose a new U.S. policy toward the Middle East.

"Without question, the alliance is at a crossroads. It cannot stand or survive as it has been. To maintain the strength of our ties, this alliance needs significant changes and a new direction," he said.

Emanuel said policies ranging from settlement expansion and settler violence in the occupied West Bank to restrictions on aid to Gaza were contributing to Israel's declining support among Americans, particularly younger voters.

His speech offered an unusually blunt warning from a prominent Democrat that longstanding U.S. political support can no longer be taken for granted.

Support for Israel has become one of the most divisive issues ahead of November U.S. midterm elections in which progressive Democratic candidates have won primary contests while opposing U.S. funding for Israel.

Israel's favorability rating among Democrats fell from 59% in 2018 to 22% in May, according to Reuters/Ipsos polling. Support remains strong among Republicans, though some elements of Trump's coalition have also called for cutting off aid.

Emanuel said Washington's unconditional backing had enabled Netanyahu, in power almost consecutively since 2009, to ignore American concerns and pursue policies that have led to violence, destabilization and Israel's increasing diplomatic isolation.

A spokesperson for Netanyahu did not immediately respond to a request for comment.

EMANUEL CALLS FOR ENDING DEFENCE SUBSIDIES FOR ISRAEL

While Israel has long enjoyed strong bipartisan...