“Our president said in 2012 that his administration has Israel’s back,” Graham said ahead of the vote. “This is a chance for the Senate to also say we have Israel’s back.”

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Menendez said Iran was the “the paramount national security challenge we face.”

S.Res. 65 also supports the full implementation of U.S. and international sanctions on Iran, which Graham said have been working but too slowly.

“This is about preventing Iran from getting a nuclear weapon,” Sen. John HoevenJohn HoevenGOP considers keeping ObamaCare taxes Senators want governors involved in health talks Republicans go to battle over pre-existing conditions MORE (R-N.D.) said. “If Iran can’t sell their oil, they won’t have revenue and won’t be able to build a nuclear weapon.”

The resolution says, “if Israel is compelled to take military action in self-defense against Iran's nuclear weapons program, the U.S. government should provide Israel with diplomatic, military and economic support.”

The resolution expressly says it’s not a declaration of war.

“Today the Senate will send a clear and unequivocal message to Iran,” Sen. John McCainJohn McCainFrustrated Dems say Obama botched Russia response Coats: Trump seemed obsessed with Russia probe The Hill's Whip List: Senate ObamaCare repeal bill MORE (R-Ariz.) said. “The United States will not allow you to get nuclear weapon capability.”

Menendez, the Senate Foreign Affairs Committee chairman, said his committee would continue to look at other options, including increasing military pressure, in order to keep Iran from getting a nuclear weapon.