Congress can trivially defund anything they please. It is illegal to spend money that hasn't been directly allocated by Congress. The US's problem is that Cong

Congress can trivially defund anything they please. It is illegal to spend money that hasn't been directly allocated by Congress. The US's problem is that Congress has abdicated most of its power to government agencies in the Executive branch, and politicians are happy with this as it makes them less responsible for failures to properly govern.