Judge Andrew Napolitano gave us the answers this morning on Fox and Friends as legal experts debate whether missile strikes on Syria would be legal without congressional approval.

The judge explained that it is legal under the War Powers Resolution for the president to authorize the strikes, but the campaign cannot go beyond 90 days.

He said President Obama does not need the approval of lawmakers because Congress has already given the president the necessary authority when it passed the War Powers Resolution in 1973.

Napolitano said it's still debated today whether the federal statute is constitutional, since the founders intended only for Congress to be able to declare war. He noted that every president since Nixon has committed U.S. troops to action by using the War Powers Resolution.

"It's mystifying why the president wants the approval of Congress," said Napolitano.