“It was not unconstitutional” Wrong he has No Power to Declare war and an attack on a sovereign nation is an Act of War.
Article 1 section 8 (Power of CONGRESS)
“To declare War, grant Letters of Marque and Reprisal, and make Rules concerning Captures on Land and Water;”
Article II The Executive, No Power of war mention Period.
No Direct threat from Syria on the US, His own words were because of the children!
Beyond that he has broken an international treaty of which the US is a signatory and thus can be held to account. UN charter Article 2.
God Bless
Apparently you haven’t read the war powers act