Jewish donors and fund-raisers are warning the Obama reelection campaign that the president is at risk of losing financial support because of concerns about his handling of Israel. Some Jewish donors say President Barack Obama has pushed Israeli leaders too hard to halt construction of housing settlements in disputed territory, a longstanding element of U.S. policy. Some also worry that Mr. Obama is putting more pressure on the Israelis than the Palestinians to enter peace negotiations, and that the president has allowed relations with Israeli Prime Minister Benjamin Netanyahu to fray. One top Democratic fund-raiser, Miami developer Michael Adler, said...