[friend_and_foe]

Congress, via impeachment.

Look, the president can't do something like start a war without permission from congress. Congress basically delegated that authority to the president. If the president then uses it irresponsibly (as has happened numerous times since congress made this decision) then that's the fault of congress. They can very easily pass legislation requiring a declaration of war and take that power back if they want to.

[anderber]

But each party will protect their president, and you need a two-thirds to impeach. I just don't see the modern senate ever impeaching a President. We've seen today how far they will go to ignore reality and lie to make sure their leader doesn't suffer any consequences.