Presidential term-limits are common in both presidential and semi-presidential systems, and also exist in parliamentary systems (both where the Head of State is directly and indirectly elected), while in the latter systems they are not imposed on prime ministers, whose mandate, unlike those of Presidents, may be withdrawn by parliament at any time. In presidential and semi-presidential systems, term-limits on the office of the President therefore are a check against the danger of abuse of power by the head of the executive branch. As such, they pursue the legitimate aims to protect human rights, democracy and the rule of law. The entitlement to run for office after a first mandate cannot be guaranteed if it is otherwise provided in the constitution. Restriction of the right to be elected of incumbent presidents derives from a sovereign choice of the people in the pursuit of the above mentioned legitimate aims of general interest, which prevail over the right of the incumbent president. The criteria for such restriction must be both objective and reasonable, and may not be discriminatory to the extent that they should be neutral and should not be imposed or removed in a manner that would prematurely remove someone from office or secure the continued service of someone currently holding office (i.e., by ifting term limits). This risk may be averted if such changes do not benefit the incumbent.