Answer:
Congress has little to no role in foreign policy. Affirming or rejecting treaties or confirming the Secretary of State, who conducts foreign policy for POTUS. That’s about it.
POTUS is Constitutionally tasked with carrying out relations with foreign powers. The thought being that the Nation should speak with one voice. That isn’t to say that Congress doesn’t make their opinions heard but they have no actual authority.
The WAR POWERS ACT of 1973 (?) was an attempt to put a Congressional check on the military power of POTUS. It’s largely been a failure as Congress Critters are notoriously spineless. They would rather punt the responsibility and whine about the result that take any flack at the outcome.
But I’m not cynical about our Honored Congress.
