lol, you really think the American citizens will vote out the government or impeach their president because they act unethically or immorally? I'd love to know what you're smoking.
At the local and state level, you can strategically implement gerrymandering to create electoral districts that are strongly advantageous to you. How would a political challenger not belonging to the dominant party win there?
Authoritarian regimes frequently win elections with 80-95% of the vote. That tells me that the people "can" vote him out.