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The United States may be forced to launch an attack on Iran’s nuclear weapons facilities if diplomatic efforts and economic sanctions against the Islamic Republic fail, Sen. Joseph Lieberman said Wednesday after a meeting with Israeli officials in Jerusalem.

Appearing at a news conference with Sens. Lindsey Graham and John McCain, Lieberman was unusually harsh in his assessment of the Iranian threat. There is a broad consensus in Congress that military force can be used if necessary to stop Iran from obtaining nuclear weapons, he said.

Lieberman cited a recent set of sanctions Congress passed against Iran as a potential deterrent. But he insisted that the goal of keeping Iran from becoming a nuclear power will be accomplished "through diplomatic and economic sanctions if we possibly can, through military actions if we must," according to The Associated Press.

Although U.S. officials often say no option should be taken off the table in relation to Iran's nuclear program, this is one of the few times an official of Lieberman's standing has explicitly used the term "military action" while in Israel, The Jerusalem Post reported.