Israel’s Parliament on Wednesday held a debate on the issue, in which conservative and liberal politicians alike rushed to condemn boycotts, but differed sharply on how.

“We will recruit the world’s Jews and lovers of Israel and boycott those who boycott us,” declared Ayelet Shaked, the new right-wing justice minister. “We will boycott the boycotters.”

Zehava Galon, head of the left-wing Meretz party, said, “I want to state clearly, my colleagues and I are opposed to a boycott of Israel, but we cannot tolerate the self-victimizing policy” of people like Ms. Shaked “in which anyone who dares to criticize the occupation policy helps the anti-Semites.”

At the same time, some American Jews are increasingly focused on fighting back, as well. Sheldon Adelson, the casino tycoon who has been a major supporter of Mr. Netanyahu, is convening a meeting of wealthy pro-Israel donors in Las Vegas this weekend to create a new antiboycott movement his wife has named the Maccabees.

Participants include Haim Saban, a wealthy Israeli-American whose holdings, Saban Capital Group Inc., include a controlling stake in Partner Communications, which markets its cellphone service as Orange Israel under the licensing agreement with Orange.

Mr. Netanyahu lashed out against the boycott movement on Sunday, denying that it had anything to do with Israel’s policies toward the Palestinians and saying that it instead had to do with Israel’s very existence, likening it to age-old anti-Semitic “libels.” He has made similar remarks in several meetings with foreign leaders since.

Mustafa Barghouti, a Palestinian leader in the West Bank who has been active in advocating a boycott for years, described Mr. Netanyahu’s reaction as “hysterical” and said it was “a way of keeping his authority by spreading fear.” Mr. Barghouti said he was also disappointed with the Israeli opposition leader, Isaac Herzog, of the center left, who called the boycott trend “a new form of terrorism.”