Sen. Rand Paul on Wednesday introduced a measure that declares the United States is at war with Islamic State of Iraq and Syria terrorists in the Middle East.

Paul, a potential 2016 presidential contender, filed the measure as a joint resolution.

"I believe the president must come to Congress to begin a war and that Congress has a duty to act,” Paul said. “Right now, this war is illegal until Congress acts pursuant to the Constitution and authorizes it.”

Paul is among many lawmakers who want Congress to debate and vote on authorizing President Obama to use military force against the Islamic State, also known as ISIS.

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