War Powers in the U.S. Constitution
The framers of the U.S. Constitution divided war powers between Congress and the president. Congress has the power to declare war and to create and fund the military. The president, as commander in chief, has the power to command and control U.S. military forces.
In 1950, President Harry Truman deployed U.S. troops in South Korea as part of a United Nations military force. President Truman referred to the Korean War as a "police action" meant to uphold the rule of law. He never asked Congress for a declaration of war and one was never delivered. Later, as a result of the Vietnam War, Congress passed legislation requiring the president to withdraw troops from combat within 60 days if Congress has not declared war or approved the use of force.
Nevertheless, while Congress and the president continue to argue over war powers, the division of these powers in the U.S. Constitution remains unchanged.