Can the president declare war without Congress

Truman did it with korea.Lbj did it in vietnam, bush did it in afghanistan and iraq.The president shall be commander in chief of the army and navy of the united states….As the commander in chief of the armed forces, however, the president has the power to send troops into battle without an official war declaration from congress.In all other times, the president may use the military as he sees fit.President donald trump ordered an attack (which could have become a war) against syria without congressional approval.

The president actually has no role in declaring war.What is the role of executice in the separation of powers?Congress declared that the president could use force only when the united states was under attack, when u.s.Debate continues as to the legal extent of the president's authority in this regard.