With the exception of Helmut Schmidt, Gerhard Schröder (from 2004 to 2005) and Angela Merkel (since 2018) the chancellor has usually also been chairman of their own party. The first chancellor, Konrad Adenauer, set many precedents that continue today and established the chancellorship as the clear focus of power in Germany. Under the provisions of the Basic Law giving him the power to set guidelines for all fields of policy, Adenauer arrogated nearly all major decisions to himself. He often treated his ministers as mere extensions of his authority rather than colleagues. While his successors have tended to be less domineering, the chancellor has acquired enough ex officio authority (in addition to his/her constitutional powers) that Germany is often described by constitutional law experts as a "chancellor democracy". The chancellor determines the composition of the Federal Cabinet. The President formally appoints and dismisses cabinet ministers, on the recommendation of the chancellor; no parliamentary approval is needed. According to the Basic Law, the chancellor may set the number of cabinet ministers and dictate their specific duties. Chancellor Ludwig Erhard had the largest cabinet, with 22 ministers, in the mid-1960s. Helmut Kohl presided over 17 ministers at the start of his fourth term in 1994; the 2002 cabinet, the second of Chancellor Gerhard Schröder, had 13 ministers, and the Angela Merkel cabinet as of 22 November 2005 had 15. Article 65 of the Basic Law sets forth three principles that define how the executive branch functions:  The Chancellor must appoint one of the cabinet ministers as Vice Chancellor, who may deputise for the Chancellor, if they are absent or unable to perform their duties. Although the Chancellor is theoretically free to choose any cabinet minister as Vice Chancellor, he or she prefers, in coalition governments the Vice Chancellor is usually the highest-ranking minister of the second biggest coalition party. If the Chancellor's term in office ends or if they resign, the Bundestag has to elect a new Chancellor. The President of Germany may ask the former Chancellor to act as Chancellor until a new office holder is elected, but if they are unwilling or unable to do so, the President may also appoint the Vice Chancellor as Acting Chancellor until a successor is elected. This has happened once: On 7 May 1974 Chancellor Willy Brandt resigned as a consequence of the Guillaume Affair, an espionage scandal. In his letter of resignation to President Gustav Heinemann he wrote: President Heinemann followed the request. Walter Scheel was appointed as Acting Chancellor and served for nine days until the election of Helmut Schmidt on 16 May 1974.