Twenty-second Amendment to the United States Constitution
Some argue that the 22nd Amendment and 12th Amendment bar any two-term president from later serving as vice president as well as from succeeding to the presidency from any point in the presidential line of succession. Others contend that the original intent of the 12th Amendment concerns qualification for "service" (age, residence, and citizenship), while the 22nd Amendment, concerns qualifications for "election", and thus (strictly applying the text) a former two-term president is still eligible to "serve" as vice president (neither amendment restricts the number of times an individual can be elected to the vice presidency), and then succeed to the presidency to serve out the balance of the term (though prohibited from running for election to an additional term).
Powers of the President of Singapore
The original Article 22H of the Constitution provided the President with personal discretion to withhold assent to any bill (other than a bill to which Article 5(2A) applies) which provided directly or indirectly for the circumvention or curtailment of the discretionary powers conferred upon the President by the Constitution. At that time, Article 5(2A) provided that the President could prevent Parliament from passing a bill seeking to amend certain specified clauses of the Constitution, including those dealing with the President's powers, unless it had been supported by not less than two-thirds of the votes cast at a national referendum. However, as Article 5(2A) was not yet in force, a question arose as to whether the Government was entitled to amend the Constitution in a way that circumvented or curtailed the President's discretionary powers, or whether Article 22H prohibited this entirely.