The presidential powers act allows the Commander in Chief of the US armed forces (aka the president) to send the military anywhere in the world for up to 60 day

The presidential powers act allows the Commander in Chief of the US armed forces (aka the president) to send the military anywhere in the world for up to 60 days so long as he notifies Congress within 48 hours of making the decision to do so. This was made law under the War Powers Resolution of 1973. Then again, if you send the military somewhere hostile, in 60 days you've likely started a war regardless of what Congress thinks.