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).
Recep Tayyip Erdoğan
After the opposition parties deadlocked the 2007 presidential election by boycotting the parliament, the ruling AKP proposed a constitutional reform package. The reform package was first vetoed by president Sezer. Then he applied to the Turkish constitutional court about the reform package, because the president is unable to veto amendments for the second time. The Turkish constitutional court did not find any problems in the packet and 68.95% of the voters supported the constitutional changes.
The reforms consisted of: electing the president by popular vote instead of by parliament, reducing the presidential term from seven years to five, allowing the president to stand for re-election for a second term, holding general elections every four years instead of five and reducing the quorum of lawmakers needed for parliamentary decisions from 367 to 184.