What distinguishes ex ante influence over the budget from ex post influence over the budget?How have the mechanisms for exercising those powers affected presidential power?

What will be an ideal response?

The ideal answer should:
a. Identifyex ante influence as affecting an outcome before the fact and ex post influence as affecting an outcome after the fact.
b. Discuss how presidents assert ex ante influence during the budget proposal process through efforts to make sure that their budget proposals closely reflect their policy priorities, noting that Congress relies heavily on the president's proposal in their approval of the final budget.
c. Assess the various mechanisms that presidents have at their disposal for manipulating the budget after it has passed by redirecting federal spending, taking advantage of large grants of budgetary authority by Congress such as DERF, and through their powers of rescission and deferral.
d.Evaluate the overall effect of these powers, noting that the end result has been an increase in presidential authority over Congress.