Seems he thinks he has been asking for this all along?
Check it out:

President Obama officially asked Congress to rubber-stamp his six-month-old war against the Islamic State Wednesday, dubbing the proposed Joint Resolution an “Authorization for Use of Military Force.”

“The so-called Islamic State of Iraq and the Levant (ISIL) poses a threat to the people and stability of Iraq, Syria, and the broader Middle East, and to U.S. national security,” Obama wrote in a letter addressed to Congress. “Although existing statutes provide me with the authority I need to take these actions,” Obama continued, “I have repeatedly expressed my commitment to working with the Congress to pass a bipartisan authorization for the use of military force (AUMF) against ISIL.”

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