Some of Donald Trump's more strident critics are comparing him to Hitler. For all his faults, at least there is a separation of powers, and constitutional checks and balances, as we have recently seen with the court challenge of his immigration ban.
Hitler had absolute power to do whatever he wanted. Criticise Trump. Raise concerns about his policies. Resort to hyperbole if you wish. The office of President of the United States is a powerful one, but it is not a dictatorship.