the War Powers Act mandates president consult Congress placing U.S. armed forces in hostilities. it establishes a general 60-day period unless Congress declares war, plus extending and withdrawal keeping Congress involved and potential measures to withdraw forces. Originated to curb executive war-making in the post-Vietnam era, but disputes remain about effectiveness and constitutional power balance. it provides a possible 30-day extension to withdraw if safety concerns emerge, and it has been subject to continued discussion and proposals with efforts to clarify or reform the procedures.