"Two separate but closely related issues confront Congress each time the President introduces armed forces into a situation abroad that conceivably could lead to their involvement in hostilities. One issue concerns the division of war powers between the President and Congress, whether the use of armed forces falls within the purview of the congressional power to declare war and the War Powers Resolution. The other issue is whether Congress concurs in the wisdom of the action. This issue brief does not deal with the substantive merits of using armed forces in specific cases, but rather with the congressional authorization for the action and the application and effectiveness of the War Powers Resolution."
CRS Issue Brief for Congress, IB81050
U.S. Dept. of State, Foreign Press Centers: http://fpc.state.gov/