..nmsdc.org.. Acts Congress fix the limits of power which may exercised administrative agencies, and often the manner its exercise. Moreover, authority which granted may withdrawn. Administrators must proceed the assumption that the legislation they administer may repealed or modified. However, the power of repeal difficult exercise opportunities for obstruction in the legislative process are many, and a repealing act must essay writting services signed the President or In recent years, a method has been developed which here Congress can virtually repeal a law without the possibility defeat Presidential veto. Many emergency acts World War II were remain in effect until six months after the end the war, until a date specified in the act, or until such earlier time as the Congress concurrent resolution or the President may designate.