cosmos, nor anyone else, gets to call something obsolete on this issue because it's the senate that gets to make it's operational rules, not a president. A president cannot determine this for the senate.
“The power to declare war, including the power of judging the causes of war, is fully and exclusively vested in the legislature.” ~ James Madison, Father of the Constitution
“We do not believe in aggressive or preventive war. Such war is the weapon of dictators, not of free democratic countries like the United States.”~ Truman, Sept 1, 1950