routinely used in cases where presidents have policy disagreements with a bill. The veto – or threat of a veto – has thus evolved to make the modern presidency a central part of the American legislative process. Specifically, under the Presentment Clause, once a bill has been presented by Congress, the president has three options: Sign the legislation within ten days, excluding Sundays—the bill becomes law. Veto the legislation within the above timeframe and return it to the house of Congress from which it originated, expressing any objections—the bill does not become law, unless both houses of Congress vote to override the veto by a two-thirds vote. Take no action on the legislation within the above timeframe—the bill becomes law, as if the president had signed it, unless Congress is adjourned at the time, in which case it does not become law (a pocket veto). In 1996, Congress attempted to enhance the president's veto power with the Line Item Veto Act. The legislation empowered the president to sign any spending bill into law while simultaneously striking certain spending items within the bill, particularly any new spending, any amount of discretionary spending, or any new limited tax benefit. Congress could then repass that particular item. If the president then vetoed the new legislation, Congress could override the veto by its ordinary means, a two-thirds vote in both houses. In Clinton v. City of New York, , the U.S. Supreme Court ruled such a legislative alteration of the veto power to be unconstitutional. Setting the agenda For most of American history, candidates for president have sought election on the basis of a promised legislative agenda. Formally, Article II, Section 3, Clause 2 requires the president to recommend such measures to Congress which the president deems "necessary and expedient". This is done through the constitutionally-based State of the Union address, which usually outlines the president's legislative proposals for the coming year, and through other formal and informal communications with Congress. The president can be involved in crafting legislation by suggesting, requesting, or even insisting that Congress enact laws he believes are needed. Additionally, he can attempt to shape legislation during the legislative process by exerting influence on individual members of Congress. Presidents possess this power because the Constitution is silent about who can write legislation, but the power is limited because only members of Congress can introduce legislation. The president or other officials