The constitution gives Congress the exclusive power to formally declare war.

That said, Congress hasn’t declared war since 1942, yet we’ve obviously taken part in many wars since then.

Sadly there just hasn’t been enough Congressional support to retaliate against a president for jumping to military action without authorization. And it doesn’t help that the average American doesn’t know that the president is not allowed to just deploy troops at will (in most cases, Iran included).

The Shart Will Congeal