Three presidents of the United States of America objected the pressures & practices of Israel. Eisenhower was the first one when he presented a stern warning for Britain, France & Israel during their Tripartite Aggression against Egypt and withdrawal of their forces accordingly, followed by Nixon in seventies who refused Israel's pressures during October 1973 war, in spite of Kissinger's deception & the game of arms and money support. The last one of the three was Bush Sr. who refused Israel guarantees which value was USD ten billion as he called for Madrid Conference & tried to make an Arab Israeli settlement or compromise but the said settlement did not conform with Israel's ambitions and its leaders expansionary goals. However, the relationship with the rest of U. S. presidents since Truman until Obama preserved its intimacy where declaring that Israel's security is a part of the American Security used to be a mandatory part in the American position or attitude. We witnessed such American attitude in all wars that Israel had with the Arabs through its unlimited support to Israel. There is no other country which is enjoying a care from a superpower similar to the one provided for Israel which has been competing the United States basic allies in this regard. Currently, Israel is practicing a pressure on President Obama through exploiting the elections issue for launching a strike on / against Iran. However, Obama is aware about what does such war mean as the concerned region is strategically critical due to that most of world's oil is extracted out of the countries that over look the water of the Arabian Gulf for exporting it, in addition to that Iran is a traditional power which is, as per the international standards, a medium power that can harm its foe. As for Israel, it has, in addition to its two hundred nuclear warheads, a big amount of the traditional arms obtained through manufacturing channels or internal production. However, Israel puts the bad possibilities into consideration more that the good possibilities and that's why Netanyahu is trying to drag the United States to this war. Yet, its earlier involvement in Iraq and Afghanistan, in addition to the international situation which does not make it the situations management and control master for the time being; the United States is assuming the worst. Thus, such risky adventure is not a priority for President Obama, in spite of that it is an issue that irritates Israel's falcons due to that time factor serves the interest of Iran. Israel has not been used to hear the word "No" from the United States, except for the cases where its policies used to contradict with the ones of its biggest ally and supporter. Obama could conclude, together with his assistants and experts, that the step of striking Iran's nuclear reactors may not be a successful work. Accordingly, putting its country's interests into account is more important than the Israeli desire during the tough confrontations. Israel's estimation may conclude that Obama is going to be reelected in spite of all of its efforts. It is going, in all cases, to confront this barrier before and after the elections, unless the perception and calculations change and the two parties start a war against Iran which results or consequences are not agreed about.