[Huck]

I think that the execution of foreign policy is left to the Executive Branch for the most part, IMHO.

But you won't find that in writing. It is an "implied" power, whereas the power to make treaties is specifically limited, and the status of treaties as "law" is explicitly expressed.

[hchutch]

The President can take a foreign policy action. If Congress does not like it, they can pass a law or Joint Resolution prohibiting such actions, subject to the President's veto.