obama1.jpg525A 28-year-old Army captain has sued President Barack Obama alleging that he lacks proper authority to wage war against the global terror organization ISIS in Syria and Iraq.

Captain Nathan Michael Smith, who is deployed in Kuwait as an intelligence officer, has filed a suit in the U.S. District Court in Washington, citing his “conscience” and his oath to uphold the Constitution of the United States as the reason to file the case, NBC News reported.

Though Smith supports US’ army action in Iraq and Syria and considers them an “army of butchers”, he believes that the mission lacked proper authorization from the Congress.

“I am asking the court to tell the President that he must get proper authority from Congress, under the War Powers Resolution, to wage the war against ISIS in Iraq and Syria,” he wrote.

Meanwhile, Obama has argued that he already has the authority to wage war against ISIS under the authorization to fight perpetrators of September 11, 2011 attack.

The lawsuit comes a day after a Navy SEAL was killed in an operation in Iraq, the third since the U.S. led coalition launched its campaign against ISIS in 2014.