Got my Ivy degree in the subject, byotch.
Congress decides war or no war. Period.
The president (executive) then carries out Congress's directive.
I'd explain the Supreme Court's abnegation of duty on delegation of Constitution-assocated powers, or the bullshit murkiness of a "terror" boogeyman as proxy for a nation state, but honestly, you don't even know your basic Madison, Jefferson, and Adams -- let alone Washington.
Any weapon you hand the president of one party can be turned against you when the opposition party swears in next. There's a REASON they created checks and balances.
Take the word of one who knows much better than you. This is not a partisan thing. It's a defense of the US Constitution thing.
We have enough problems with the assault on the 2A to go adding more onto it with "unitary executive" bullshit.