Oath of office of the President of the United States case the phrase must be omitted. Given that nearly every president-elect since President Franklin D. Roosevelt has recited the codicil, it is likely that the majority of presidents-elect have uttered the phrase (as well as some vice presidents, while taking their oaths). However, as President Theodore Roosevelt chose to conclude his oath with the phrase "And thus I swear", it seems that this current of tradition was not overwhelmingly strong even as recently as the turn of the twentieth century. Since the office of President of the United States came into existence in 1789 there have been 58 public swearing-in
President of Ukraine by acting president Oleksandr Turchynov, who then also served as Chairman of the Ukrainian Parliament, on 21 February 2014. Oleksandr Turchynov was the only acting president in Ukraine's modern history. Unlike in the US, where the vice president immediately receives all powers of the presidency upon assumption of the presidential office, in Ukraine the powers of an acting president are severely limited. On 18 June 2015, Yanukovych was officially deprived of the title of president of Ukraine. The current president is Petro Poroshenko who took the oath of office on 7 June 2014. The Government of Ukraine utilizes a Semi-presidential