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Sens. Jeff Flake, R-Ariz., and Tim Kaine, D-Va., are renewing their push of a new Authorization of Military Force Against Terrorists, arguing that the original 2001 legislation is outdated.

"Bipartisanship is possible," Kaine said on MSNBC's "Morning Joe" Thursday. "Strong resolve against ISIL, a balanced approach to some of the strategic questions … it should be about putting the weight of Congress in support of the troops who are over there battling this mission."

"We've been at this sixteenth months now," Flake added, referring to the American-led campaign against the Islamic State. "More than anything, this has metastasized. ISIS is not just in Syria and Iraq, they're elsewhere. So I think that there's a growing realization that we need to have this debate, and we need a war resolution."

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