Read USA law and constitutions. It is given in the law he can do this way before his presidency. And read up what happens on the other side to understand what really is "dictatorship" by changing laws to suit. Proportional system looks great on paper but consistently produce "proportional" government that can't act strongly due to political parties in-fighting. There is reason vast majority of people whether American or not accept the concept of manifest destiny. None ever accorded to GB, France, Spanish, Portugal, Italian or Germany even during their height of military superiority.