As soon as Congress grants President Barack Obama a new authorization for the use of military force against terrorists, it will no long have any say in how the war is run, says retired Judge Andrew Napolitano.

Obama said in remarks from the White House Wednesday that he does not want American ground troops included in any use of force. But Napolitano said that means nothing.

"Under the Constitution and the law, once the Congress authorizes the use of military force it cannot tell the president how he uses that military force," Napolitano said on Fox News Channel's "Shepard Smith Reporting." 

"So whatever resolution they adopt, unless there's an expressed statement in there 'You may not use ground troops,'" Obama or any future president cannot be prohibited from sending in ground forces.

"The president needs consensus, and Congress needs to know, no matter what promises the president makes, once you authorize the use of military force, it's all in the president's hands, it's all his judgment, he can unleash and restrain as he sees fit," Napolitano said.

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