matters. Clause 2: Independence from the executive Senators and representatives may not simultaneously serve in Congress and hold a position in the executive branch. This restriction is meant to protect legislative independence by preventing the president from using patronage to buy votes in Congress. It is a major difference from the Westminster political system in the British Parliament as well as those of some other nations using the parliamentary system, where cabinet ministers are required to be members of parliament. Furthermore, senators and representatives cannot resign to take newly created or higher-paying political positions; rather, they must wait until the conclusion of the term for which they were elected. If Congress increases the salary of a particular officer, it may later reduce that salary to permit an individual to resign from Congress and take that position (known as the Saxbe fix). The effects of the clause were discussed in 1937, when Senator Hugo Black was appointed an associate justice of the Supreme Court with some time left in his Senate term. Just prior to the appointment, Congress had increased the pension available to Justices retiring at the age of seventy. It was therefore suggested by some that the office's emolument had been increased during Black's senatorial term, and that therefore Black could not take office as a justice. The response, however, was that Black was fifty-one years old, and would not receive the increased pension until at least 19 years later, long after his Senate term had expired. Section 7: Bills Clause 1: Bills of revenue This establishes the method for making Acts of Congress that involve taxation. Accordingly, any bill may originate in either House of Congress, except for a revenue bill, which may originate only in the House of Representatives. In practice, the Senate sometimes circumvents this requirement by substituting the text of a revenue bill previously passed by the House with a substitute text. Either House may amend any bill, including revenue and appropriation bills. This clause of the U.S. Constitution stemmed from an English parliamentary practice that all money bills must have their first reading in the House of Commons. This practice was intended to ensure that the power of the purse is possessed by the legislative body most responsive to the people, although the English practice was modified in America by allowing the Senate to amend these bills. The clause was part of the Great