The Prime Minister is subject to the powers of the Queen/Governor General and Parliament even if these constraints sometimes seem largely nominal in practice or don't seem to mean much except  as traditional constraints  on how far a PM will go so long as there is a strong majority party in power that the PM controls.  Erdogan is effect combining the powers of all three in one office, turning the Turkish PM into a stooge of the formerly largely symbolic President and allowing the President to govern without and against a majority of Parliament. This, incidentally, is what George III attempted in the 1770s and failed to achieve, giving us our parliamentary democracy.  Or, to use another example, it's as if the US President  sought to get rid of any check from Congress. A better discussion  is : http://www.theglobeandmail.com/opinion/after-referendum-turkey-is-more-divided-than-ever/article34717640/. Finally