Twenty-second Amendment to the United States Constitution
As worded, the primary focus of the 22nd Amendment is on limiting individuals twice elected to the presidency from being elected again. Due to this, several issues could be raised regarding the amendment's meaning and application, especially in relation to the 12th Amendment, ratified in 1804, which states, "But no person constitutionally ineligible to the office of President shall be eligible to that of Vice-President of the United States". While it is clear that under the 12th Amendment the original constitutional qualifications of age, citizenship, and residency apply to both the president and vice president, it is unclear whether someone who is ineligible to be elected president could be elected vice president. Because of this apparent ambiguity, there may be a loophole in the 22nd Amendment whereby a two-term former-president could be elected vice president and then succeed to the presidency as a result of the incumbent's death, resignation, or removal from office (or even succeed to the presidency from some other stated office in the presidential line of succession).
Twelfth Amendment to the United States Constitution
To prevent deadlocks from keeping the nation leaderless, the Twelfth Amendment provided that if the House did not choose a President before March 4 (then the first day of a Presidential term), the individual elected Vice President would "act as President, as in the case of the death or other constitutional disability of the President." The Twelfth Amendment did not state for how long the Vice President would act as President or if the House could still choose a President after March 4. Section 3 of the Twentieth Amendment, adopted in 1933, supersedes that provision of the Twelfth Amendment by changing the date upon which a new presidential term commences to January 20, clarifying that the Vice President-elect would only "act as President" if the House has not chosen a President by January 20, and permitting Congress to statutorily provide "who shall then act as President, or the manner in which one who is to act shall be selected" if there is no President-elect or Vice President-elect by January 20. It also clarifies that if there is no President-elect on January 20, whoever acts as President does so until a person "qualified" to occupy the Presidency is elected to be President.