Prime Minister Sharon faces questions over whether a recent Manhattan fund-raising event violated Israeli campaign-finance regulations, according to Israeli press reports.

An Israeli television station on Tuesday evening reported that Mr. Sharon attended a dinner at the Fifth Avenue apartment of Nina Rosenwald with dozens of wealthy guests who were asked by Ms. Rosenwald to donate at least $10,000 to a nonprofit organization that runs a yeshiva in New York City and operates in Israel, the Israeli newspaper Haaretz reported.

The allegations against Mr. Sharon come as the Israeli leader confronts a revolt among opponents in his Likud Party, who are demanding that he call for early primary elections and run against Benjamin Netanyahu, a former prime minister, who opposed the withdrawal of Gaza settlements.

Haaretz reported that Israel’s attorney general, Menachem Mazuz, said he would look into whether the donations raised at the dinner violated Israeli election law, which prohibits primary candidates from accepting donations that exceed $7,800 a family. It’s not clear how much money was raised, how it was to be used, or whether the money has since been returned to donors.

The attorney general’s office has conducted investigations into campaign fund raising by Mr. Sharon but did not charge him due to lack of evidence.

The invitation to the dinner, which was held on Sunday, said: “Sadly, Sharon does not enjoy the financial backing that Netanyahu has garnered over the last several decades from many leaders of the international financial community,” according to Haaretz.

“Therefore, we are please asking if you might donate a fully tax-deductible contribution of $10,000 per couple to a not-for-profit organization that operates throughout Israel and has been particularly effective at bringing people to the polls. All contributions must be received before the event. Please help. The future of Israel is literally at stake,” the invitation reportedly said.

The dinner was attended by 30 people, including real estate magnate Larry Silverstein and Israel Bonds president Yehoshua Matza, Haaretz reported.

Israeli election laws, which are less stringent in primary elections than in general elections, stipulate that political parties are responsible for supervising fund raising. Ms. Rosenwald, an heir to the Sears fortune who serves on the board of several Jewish, pro-Israeli, and human rights organizations, did not return calls seeking comment.