Question

What is the most effective way for congress to prevent a presidents foreign policy

Answer 1

to cut off budget support for that policy 

Answer 2

to cut off budget support for that policy.

Step-by-step explanation:

The most effective way for congress to prevent a president's foreign policy is to cut off budget support for that policy. If the budget support for the policy is cut, then the president cannot carry out his plans due to a lack of resources. In this way, the powers of the president are limited due to the authority of Congress, in a system that is called checks and balances.