the most important legislative function of the eggs branch cannot be found an article to the presentment clause requires that every bill passed by Congress must be presented to the president for signature if the president signs the bill becomes a law the president is not obligated to sign a bill however under the terms of the presentment clause the president may return the bill with objections for reconsideration for example the president might refuse to sign a bill he believes is unconstitutional but this is not a requirement the president can exercise the veto power for any reason of course Congress can override a presidential veto with a two-thirds vote we've talked about what happens when the president signs a law or vetoes it but what happens that the president does nothing if Congress is in session and the President does not sign a bill it automatically takes effect when Congress is not in session the president can exercise the so-called pocket veto basically if the President does not sign a bill while Congress is adjourned or at recess that bill will not become a law this is a pretty significant power because Congress cannot override a pocket veto you