Prime minister leader, the incoming leader will usually be referred as "prime minister-in-waiting". An example or this situation was in 2016 in the United Kingdom when Theresa May was elected leader of the Conservative Party while David Cameron was still prime minister. Ukraine's constitution (1996) lists the powers, functions and duties of the Prime Minister of Ukraine. Most prime ministers in parliamentary systems are not appointed for a specific term in office and in effect may remain in power through a number of elections and parliaments. For example, Margaret Thatcher was only ever appointed prime minister on "one" occasion, in 1979. She
Prime Minister of the United Kingdom powerful than the American presidents, as the Prime Minister is part of the legislature, and unlike presidents, can directly initiate legislation. Thus, Dowding argues that adding to these powers, makes the Prime Minister less like presidents, and that what Britain is witnessing is not presidentialisation but, increase in powers overtime, can be best explained as "Prime Ministerialisation" of British politics. Regarding the thesis, Dowding writes: "The presidentialisation of the Prime Minister thesis should be expunged from political science vocabulary, to the extent that the forces identified by those who pursue the thesis exist, they do not make the British Prime