WASHINGTON (AFP) - The US Senate on Thursday unanimously adopted harsh new economic sanctions on Iran, dismissing US officials fears they risked fracturing global unity on blocking Tehrans suspected nuclear weapons programme. Lawmakers voted 100-0 to include the measure, which aims to cut off Irans central bank from the global financial system, in a must-pass annual military spending bill poised for final approval. Senators rebuffed an 11th-hour campaign from top aides to President Obama who warned the legislation could shatter a growing but fragile global consensus on confronting the defiant Islamic republic over its nuclear drive. The measure, crafted by Democratic Senator Robert Menendez and Republican Senator Mark Kirk, calls for freezing the US-based assets of financial institutions that do business with the central bank. It would apply to non-US central banks that do so for the purpose of buying or selling petroleum - Irans chief source of revenues - or related goods, amid growing fears that time is running short to solve the standoff peacefully. This is the right amendment, at the right time, sending the right message in the face of a very irresponsible regime, Kirk said. This is the maximum opportunity to have a peaceful diplomacy tool to stop Irans march to nuclear weapons, said Menendez. US officials have warned that depriving global markets of Iranian exports could send oil prices sharply higher, handing Tehran a windfall at a time when it has struggled to cope with painful international economic sanctions. To address that, Kirk and Menendezs measure says the sanctions would only apply if Obama determines that there is sufficient oil from other producers to avoid disrupting global markets, and enables him to delay them if he determines that to be vital to US national security interests. And Kirk said this week that Saudi Arabias ambassador had told him of the kingdoms great willingness to boost its output to meet any resulting shortfall in supply. The sanctions would not apply to sales of food, medicine and medical devices. Earlier, Undersecretary of State for Political Affairs Wendy Sherman and Treasury Undersecretary for Terrorism and Financial Intelligence David Cohen warned the plan risked alienating key allies and inadvertently lining Irans pockets. We all agree with the impulse, the sentiment, the objective, which is to really go at the jugular of Irans economy, Sherman said in a frequently contentious hearing of the Senate Foreign Relations Committee. But there is absolutely a risk that, in fact, the price of oil would go up which would mean that Iran would, in fact, have more money to fuel its nuclear ambitions, not less, she said. Now, more than ever, it is imperative that we act in a way that does not threaten to fracture the international coalition of nations, Cohen said at a hearing just hours before lawmakers were to vote on the plan. Sherman and Cohens entreaties ran headlong into sharp criticisms from lawmakers impatient with the pace and scope of pressure on Iran and worried time was running short until the US nemesis joins the club of nuclear nations.