We don't need them. They'll never see things our way, no matter what. Let them go.

It's a new Israeli approach which borrows from the very worst of our aging instincts. It says: We're moral, our enemies are out to exterminate us along with our state, that's all you need to know. No modifications necessary. Stay the course. Concede nothing. Ease no siege. Give no ground. Ever.

It is a radical redefinition of postmodern Zionism, this time from the right. Over the past weeks, it's been test-run in our relationship with Turkey, with the Goldstone Commission, with Mahmoud Abbas - and with consistent results.

Now it's about to be tested out on North American Jewry, some 6 million strong, a community at a critical crossroads, and one that will have lasting and - if mishandled - dangerous consequences for Israel.

The former chairman of the governing board of the World Jewish Congress, Isi Leibler, fired the opening shot this month when he declared it "our obligation to confront the enemy within - renegade Jews - including Israelis who stand at the vanguard of global efforts to demonize and delegitimize the Jewish state."

"Such odious Jews can be traced back to apostates during the Middle Ages who fabricated blood libels and vile distortions of Jewish religious practice for Christian anti-Semites to incite hatred which culminated in massacres," Leibler wrote in The Jerusalem Post. "It was in response to these renegades that the herem [excommunication] was introduced."

Citing the example of Jewish communists who applauded Stalinist executions of fellow Jews on trumped-up charges, Leibler added, "Like their contemporary counterparts, some of them attempted to depict themselves as devoted Jews championing 'world peace'."

Among these counterparts, it develops, is J Street, the new dovish lobbying organization which describes itself as pro-Israel and pro-peace. Writing ahead of J Street's first national conference, which begins on Sunday in Washington, Leibler argued that although J Street and other American Jewish groups critical of Israel may describe themselves as Zionist, "their prime objective is to pressure the U.S. government to use 'tough love' against Israel - a euphemism for demanding that the Jewish state make further unilateral concessions to neighbors pledged to its annihilation."

Israel's official response to J Street, which though it's been around for less than two years has been described as a counterweight to AIPAC, has been measured but far from welcoming. The embassy has decided to send an "observer" to the J Street conference, instead of Ambassador Michael Oren to speaking there.

Last week, with the invitation still unanswered, Israeli Embassy spokesman Yoni Peled was quoted as expressing concern over J Street positions at odds with those of the government in Jerusalem.

"While recognizing the need for a free and open debate on these issues, it is important to stress concern over certain policies [of J Street] that could impair Israel's interests," Peled said, an apparent reference to such J Street stances as backing President Barack Obama's call for an absolute freeze on settlements, as well as opposition to immediate sanctions on Iran.

Soon after, the group renewed its request that Oren speak at the conference, noting research which has shown younger Jews increasingly alienated from the Jewish community and from Israel, and increasingly questioning many of Israel's right-wing policies, public statements and actions.

The erudite, often outspoken Oren has been uncharacteristically mum in response to the request, despite, or perhaps because of, the long list of some 150 U.S. senators and members of Congress which J Street has published as honorary hosts of a gala dinner to be held during the conference. The list has apparently dismayed both AIPAC and conservative commentators.

The ambassador should accept the invitation. He should speak forthrightly on the ways Israel's government views the future differently from J Street and the other dovish groups co-sponsoring the gathering. Together, they represent a growing segment of the future of American Jewry, a community with which Israel cannot afford to lose touch.

To slight the conference is to dismiss the deep love of Israel felt by many of its critics abroad. To send a low-level diplomat in place of the ambassador sends a message which, in some respects, can only please Isi Leibler and the subtext of his message: These doves, they're not really pro-Israel. They can't be. They're doves. And they're not really Jews, either. How could they be? Not only are they doves, most of them aren't even Orthodox.

Leibler, meanwhile, has another plan. Because Prime Minister Benjamin Netanyahu is "currently riding a wave after his superb United Nations address," Leibler writes, he should convene a global solidarity conference of Jewish leaders, opinion makers, philanthropists and activists "in order to demonstrate the unity of the Jewish people."

And what of J Street and the spectrum of Jewish leftists and peace advocates? The world unity conference would deal with them as well. According to Leibler, "in addition to encouraging millions of Jews in the Diaspora who remain committed to Israel to become more actively engaged in our struggle, such a gathering would also provide an opportunity to exorcise the renegades from our midst."