One of the rare big changes in the US governmental system occurred during Trump’s term. It was not done by Trump, but by his enemies. America will never be the same. You might not have noticed because the news media did not tell you.
The 2020 election might be a moment of truth for the Democratic Party as its liberal establishment confronts the powerful Left they have nurtured for so long. Whether the Democrats win or lose, American politics will not be the same.
Presidential power grown for generations. Nothing can stop it except impeachment and removal of a president. Unless we find the will to do it, presidents will continue to regard us with contempt. Rightly so.