Fully 60 percent of Americans believe the Obama administration’s economic sanctions aren’t stopping Iran from developing nuclear weapons, and half say the U.S. should bomb Iran if the sanctions don’t work, a new poll has found.

The Quinnipiac University poll released Wednesday showed that 88 percent of Americans think Iran’s suspected weapons program is a serious threat to U.S. national security. Nearly half of those polled believe the U.S. should support Israel if it takes military action against Iran.

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The Obama administration on Monday announced new economic sanctions against Iran, including penalties aimed at companies in the country’s petrochemical sector. The U.S. government also took the step of labeling Iran’s central bank as a money-laundering outfit, discouraging other nations and financial institutions from doing business with it.

But many lawmakers in Congress say the new sanctions don’t go far enough, and are urging President Obama to take stronger steps against Iran.

A report by the United Nation’s atomic watchdog agency on Nov. 8 strongly suggested that Iran is continuing to work apace at developing nuclear weapons.