Article I, Section 6, Clause 2:
No Senator or Representative shall, during the Time for which he was elected, be appointed to any civil Office under the Authority of the United States, which shall have been created, or the Emoluments whereof shall have been encreased during such time; and no Person holding any Office under the United States, shall be a Member of either House during his Continuance in Office.
The reasons for excluding persons from offices, who have been concerned in creating them, or increasing their emoluments, are to take away, as far as possible, any improper bias in the vote of the representative, and to secure to the constituents some solemn pledge of his disinterestedness. The actual provision, however, does not go to the extent of the principle; for his appointment is restricted only `during the time, for which he was elected'; thus leaving in full force every influence upon his mind, if the period of his election is short, or the duration of it is approaching its natural termination. 1 As might be expected, there is no judicial interpretation of the language of the clause and indeed it has seldom surfaced as an issue.
In 1909, after having increased the salary of the Secretary of State, 2 Congress reduced it to the former figure so that a Member of the Senate at the time the increase was voted would be eligible for that office. 3 The clause became a subject of discussion in 1937, when Justice Black was appointed to the Court, because Congress had recently increased the amount of pension available to Justices retiring at seventy and Black's Senate term had still some time to run. The appointment was defended, however, with the argument that, because Black was only fifty-one at the time, he would be ineligible for the
increased emolument for nineteen years and it was not as to him an increased emolument. 4 In 1969, it was briefly questioned whether a Member of the House of Representatives could be appointed Secretary of Defense because, under a salary bill enacted in the previous Congress, the President would propose a salary increase, including that of cabinet officers, early in the new Congress, which would take effect if Congress did not disapprove it. The Attorney General ruled that, as the clause would not apply if the increase were proposed and approved subsequent to the appointment, it similarly would not apply in a situation in which it was uncertain whether the increase would be approved. 5