Davros, here in the U.S.A. Senate and House committees have lots of power, not the day to day power, but the power of oversight. In other words they can stop the whole ball of wax if they want, it all part of the checks and balances hoopla. The President can direct something to happen but Congress can say no or at least sure go ahead and try but we're not funding it and effectively KILL it. ie: the ending of U.S. military matterial suport of South Vietnam, Nixon said we will support you, Congress said sure you can support them all you want but we are not funding any support. Support was Killed.
Here in the US Congress is the real power, and ladies and gentlemen that is truly scary.