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
Deputy Prime Minister of the United Kingdom Deputy Prime Minister of the United Kingdom The Deputy Prime Minister of the United Kingdom (DPM) is a senior member of the Cabinet of the United Kingdom. The office of the Deputy Prime Minister is not a permanent position, existing only at the discretion of the Prime Minister, who may appoint to other offices – such as First Secretary of State – to give seniority to a particular cabinet minister. Due to the two offices tending not to coincide, and both representing the Prime Minister's deputy, journalists will often refer to the First Secretary of State as the Deputy PM.