If the POTUS signs the Bill, why would it be returned to Congress? The Executive Branch executes the laws enacted by Congress and signed into law by the POTUS. http://en.wikipedia.org/wiki/Preside...gislative_role The first power the U.S. Constitution confers upon the president is the legislative power of the presidential veto. The Presentment Clause requires any bill passed by Congress to be presented to the president before it can become law. Once the legislation has been presented, the president has three options:Sign the legislation; the bill then becomes law. Veto the legislation and return it to Congress, expressing any objections; the bill does not become law, unless each house of Congress votes to override the veto by a two-thirds vote. Take no action. In this instance, the president neither signs nor vetoes the legislation. After 10 days, not counting Sundays, two possible outcomes emerge: If Congress is still convened, the bill becomes law. If Congress has adjourned, thus preventing the return of the legislation, the bill does not become law. This latter outcome is known as the pocket veto. If you'll notice the last part, it specifies that Congress may or may not be in session when a Bill is signed into law. So why do you keep insisting that Congres must be in session in order for the POTUS to sign a Bill? Congress has been adjourning after presenting a Bill to the POTUS for signing since longer than I can remember them doing it, which at this point is 8 administrations....and counting.