By any standard, Israeli Prime Minister Benjamin Netanyahu’s performance in Washington this week was stunning in its audacity and intensity.

However, his speech before the U.S. Congress will probably be seen as negative rather than positive for Israel in the long run, for the fault lines it revealed and the precedents it set.

All four dynamics have their ups and downs, but when they converge, as may be the case now, Netanyahu the brash star performer in Washington, may be seen as a political jerk, in Israel and in the U.S.

Netanyahu’s extraordinary reception in the Congress, full of hysterical adulation and blind, rabid support for any position that he took, clarified an important point in current American-Israeli ties: Congress is Israel’s most important terrain and its main line of defense in the United States, which Israel controls with unheard of unanimity. This is due to the very simple fact that every American member of Congress lives in absolute fear of being denounced by the pro-Israel lobbies as unfriendly to Israel, which would immediately result in that member losing their seat in the next election. This has happened enough times in the recent past, affecting people like Charles Percy, Paul Findley, Pete McCloskey and others, to make incumbent members refrain from testing the immense power of pro-Israeli forces to destroy an American political career.

Such practice is perfectly legal and normal in American political terms. However it is distasteful to most Americans to see Congress becoming a manipulated tool in the hands of a foreign power that uses it as a platform to challenge the American president.

Congressional subservience to Israel revealed itself as so exaggerated last week that many Americans took notice – and some started to speak out. Analysts, columnists and ordinary Americans alike started asking if they should put up with a foreign leader lecturing the president in the White House, and wondering if their Congress represents American or Israeli interests in the Middle East.

This attitude will once again open the debate that started a few years ago (after the publication of the book “The Israel Lobby”) about whether the pro-Israel lobbies are healthy or destructive for Americans. When the American and Israeli leaders mistrust or dislike each other and each other’s policies, and when foreigners intervene between the U.S. Congress and presidency, this can only spell trouble for Israel down the road, if these breaches are not quickly repaired.

The Obama position that Israeli-Palestinian negotiations for a permanent peace accord should be based on the 1967 lines with agreed swaps is not new. But it is significant for the fact that it marks the second major issue (the Israeli settlements freeze demand being the other) on which Obama has publicly declared the preferred American policy as one that is independent of Israeli policy.

Israel cannot accept that the U.S. and its president take positions on issues of strategic concern to Israelis that diverge from the Israeli position. That the U.S. president has now done this twice in two years is the equivalent of an existential threat from Israel’s perspective. That is why Netanyahu went berserk and showed how Israel can effectively dictate the position of the Congress on Middle East-related issues.

Netanyahu also faces problems at home, to judge by a new poll in Israel showing that 57 percent of the population thinks he should have agreed with Obama rather than oppose him. The Israeli public knows that the U.S. is Israel’s most important long-term strategic ally, and one not one to be alienated. The events in Washington last week showed that Israel relies heavily on the U.S. for its strategic wellbeing and survival, but also that Congress, in turn, relies heavily on Israeli approval for its own wellbeing and continued incumbency.

With the U.S. Congress now finding its extreme position on Israel somewhat isolated from the relatively more balanced position of the American president and public, Israel is slipping dangerously toward a point where its political support in the U.S. is as much a consequence of frightened, nearly prostituted, legislators as it is a reflection of the deep and firm support for the security of Israel that the United States traditionally saw as a worthy goal in its own right.

These fascinating movements in the Israeli-American relationship are worth monitoring. While being dazzled by Netanyahu’s powerful, self-assertive, performance in Washington, we should pay more attention to the underlying fault lines that such a dramatic show reveals.

Rami G. Khouri is published twice weekly by THE DAILY STAR.