in the form of passports. Doing this, the secretary also ensures the protection of citizens, their property, and interests in foreign countries. Secretaries of state also have domestic responsibilities, entrusted in 1789, when the position was first created. These include the protection and custody of the Great Seal of the United States, and the preparation of some presidential proclamations. In the process of extraditing fugitives to or from the country, the secretary serves as the channel of communication between foreign governments, the federal government, and the states. Most of the domestic functions of the Department of State were gradually transferred to other agencies by the late 19th century as part of various administrative reforms and restructurings. Those that remain include storage and use of the Great Seal, performance of protocol functions for the White House, and the drafting of certain proclamations. The secretary also negotiates with the individual states over the extradition of fugitives to foreign countries. Under federal law, the resignation of a president or of a vice president is valid only if declared in writing, in an instrument delivered to the office of the secretary of state. Accordingly, the resignations of President Richard Nixon and of Vice President Spiro Agnew were formalized in instruments delivered to then-Secretary of State Henry Kissinger. Although they have historically decreased over time, Congress may occasionally add to the responsibilities of the secretary of state. One such instance occurred in 2014, when Congress passed the Sean and David Goldman International Child Abduction Prevention and Return Act which mandated actions the Secretary of State must take in order to facilitate the return of abducted children from nations who are party to the Hague Convention on the Civil Aspects of International Child Abduction. As the highest-ranking member of the cabinet, the secretary of state is the third-highest official of the executive branch of the U.S. federal government, after the president and vice president, and is fourth in line to succeed the presidency, after the vice president, the speaker of the House of Representatives, and the president pro tempore of the Senate. Six past secretaries of stateJefferson, Madison, Monroe, John Quincy Adams, Van Buren and Buchananhave gone on to be elected president. Others, including Henry Clay, Daniel Webster, Lewis Cass, John C. Calhoun, John M. Clayton, William L. Marcy, William Seward, Edward Everett, Jeremiah S. Black, James Blaine, Elihu B. Washburne, Thomas F. Bayard, John Sherman,