The Acts of 1886 and 1947
By the Presidential Succession Act of January 19, 1886,[42] recently repealed, Congress provided that, in case of the disqualification of both President and Vice President, the Secretary of State should act as President provided he possessed the qualifications laid down in clause 5, above; if not, then the Secretary of the Treasury, etc. The act apparently assumed that while a member of the Cabinet acted as President he would retain his Cabinet post. The Succession Act now in force was urged by President Truman, who argued that it was "undemocratic" for a Vice President who had succeeded to the Presidency to be able to appoint his own successor. By the act of July 18, 1947[43] the Speaker of the House and the President pro tempore of the Senate are put ahead of the members of the Cabinet in the order of succession, but when either succeeds he must resign both his post and his seat in Congress; and a member of the Cabinet must in the like situation resign his Cabinet post. The new act also implements Amendment XX by providing for vacancies due to failure to qualify of both a newly elected President and Vice President.
COMPENSATION AND EMOLUMENTS
Clause 7 may be advantageously considered in the light of what has been determined as to the application of the parallel provision regarding judicial salaries. See pp. [530-531].[44]
OATH OF OFFICE
What is the time relationship between a President's assumption of office and his taking the oath? Apparently the former comes first. This answer seems to be required by the language of the clause itself, and is further supported by the fact that, while the act of March 1, 1792 assumes that Washington became President March 4, 1789, he did not take the oath till April 30th. Also, in the parallel case of the coronation oath of the British Monarch, its taking has been at times postponed for years after the heir's succession.
Effect of the Oath
Does the oath add anything to the President's powers? Again to judge from its English-British antecedent, its informing purpose is to restrain rather than to aggrandize power. Jackson, it is true, appealed to the oath in his Bank Veto Message of July 10, 1832; and Lincoln did so in his Message of July 4, 1861; as did Johnson's counsel in his impeachment trial; but in each of these instances the Presidential exercise of power involved rested primarily on other grounds.
Section 2. Clause 1. The President shall be Commander in Chief of the Army and Navy of the United States, and of the Militia of the several States, when called into the actual Service of the United States; he may require the Opinion, in writing, of the principal Officer in each of the executive Departments, upon any Subject relating to the Duties of their respective Offices, and he shall have Power to grant Reprieves and Pardons for Offences against the United States, except in Cases of Impeachment.
The Commander in Chiefship