What principle of us government prevents congress from voiding actions of an executive agency?

The principle of separation of powers prevents Congress from unilaterally voiding actions of an executive agency. This principle delineates the distinct roles and responsibilities of the legislative, executive, and judicial branches of government, ensuring that each branch operates independently. While Congress has the authority to pass laws and provide oversight, it cannot directly overturn actions taken by executive agencies without going through the appropriate legislative processes or judicial review.