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President Obama's decision to send special operations ground forces into Syria is again prompting calls for specific authorization from Congress to wage war.
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For months, members of Congress called on the president to seek approval for the use of military force. But when he finally did so, the climate suddenly changed.
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The new Authorization for the Use of Military Force, or AUMF as it's known, bans the use of U.S. forces "in enduring offensive ground combat operations."