In April 2017 Erdoğan successfully sponsored legislation effectively making it illegal for the Turkish legislative branch to investigate his executive branch of government. Without the checks and balances of freedom of speech, and the freedom of the Turkish legislature to hold him accountable for his actions, many have likened Turkey's current form of government to a dictatorship with only nominal forms of democracy in practice. At the time of Erdoğan's successful passing of the most recent legislation silencing his opposition, United States President Donald Trump called Erdoğan to congratulate him for his "recent referendum victory".