The United States is currently waging an illegal war against ISIS in Iraq and Syria, an Army officer said in a lawsuit Wednesday that carries major constitutional implications for the Obama administration's campaign against the militant group.

Nathan Smith, a U.S. Army captain and intelligence officer currently stationed in Kuwait, filed the lawsuit in a federal district court in Washington, D.C. In it, he argues President Obama violated the War Powers Resolution by continuing the conflict without congressional support within the law's timeframe.

"The President did not get Congress's approval for his war against ISIS in Iraq or Syria within the sixty days, but he also did not terminate the war," the lawsuit states. "The war is therefore illegal."