As we learned with Trump, there aren't enough limits on the president's power. Especially if the majority in congress just want to keep the bs power coming from their majority - they won't vote against them. The us constitution is vulnerable to the charismatic dictator trope. I wouldn't have believed it before Trump, but a lot of people went along with him because they thought they could stop him later, they thought he wouldn't go that far, they thought other people would stop him. But in our country, we need much greater limits on the president in law and the constitution.