Freeport-McMoRan Inc. v. K N Energy, Inc.

holding that INS guidelines contained in a memorandum were not intended to grant substantive rights but only intended to provide INS employees guidance | agency discretion to act "as [the president] deems necessary" is not constrained by requirements contained in executive order and agency guidelines | agency discretion to act “as [the president] deems necessary” is not constrained by requirements contained in executive order and agency guidelines