Sen. Rand Paul (R-KY) on Tuesday blocked legislation that would impose a new sanctions on Iran.

Senate Majority Leader Harry Reid (D-NV) had hoped to quickly pass the bill by unanimous consent. But Paul objected and introduced an amendment stating that any use of military force against Iran must be authorized by Congress.

“Our Founding Fathers were quite concerned about giving the power declare war to the Executive,” Paul said on the Senate floor. “They were quite concerned that the Executive could become like a king.”

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“Before sending our young men and women into combat, we should have a mature and thoughtful debate over the ramifications of and over the authorization of war and over the motives of the war,” he added.

The bill would penalize U.S. parent firms for certain Iran-related activities of their foreign subsidiaries and mandate sanctions for anyone that provides Iran with equipment that aids censorship or the suppression of human rights.

It would also formally state that U.S. policy is intended to prevent Iran from obtaining a nuclear weapon and sanction uranium mining joint ventures with Iran’s government outside of Iran.

The bill has already been approved by the Republican-led U.S. House.

Watch video, uploaded to YouTube on March 27, below: