"The purpose of my address to Congress tomorrow is to speak up about a potential deal with Iran that could threaten the survival of Israel. Iran is the foremost state sponsor of terrorism in the world," the Israeli Prime Minister said as he displayed a map reflecting the alleged terrorists attacks in various parts of the world that had alleged links to Iran.
"This is what Iran is doing now without nuclear weapons. Imagine what Iran would do with nuclear weapons," he said.
Netanyahu is due to address Congress to lobby against ongoing US efforts to reach a deal with Iran to curtail its nuclear programme.
His visit to Washington has been criticised as a breach of diplomatic protocol because he was not invited by President Barack Obama and his speech will oppose White House foreign policy.
Netanyahu denied that his speech to the US Congress was a slight to President Obama and insisted the US-Israeli alliance remains strong.
"You are here to tell the world that reports of the demise of the US relationship is not only premature, but it is wrong," the Israeli leader told delegates to a pro-Israeli conference in Washington.
"For 2000 years, my people, the Jewish people, were stateless, defenseless, voiceless. We were utterly powerless against our enemies who swore to destroy us. We suffered relentless persecution and horrific attacks. We could never speak on our own behalf, and we could not defend ourselves. Well, no more, no more," he said amidst applause.
"The days when the Jewish people are passive in the face of threats to annihilate us, those days are over. Today in our sovereign state of Israel, we defend ourselves. Being able to defend ourselves, we ally with others, most importantly, the United States of America, to defend our common civilization against common threats," he asserted.
Israel fears that Obama's Iran diplomacy, with an end-of-March deadline for a framework accord, will allow Iran to develop atomic weapons, something the country denies seeking.
