In reality what will get him impeached will be not holding to his vows to protect and preserve the American Constitution when he was made President.
1. He has his own personal bodyguards. He doesn't trust the Secret Service. Hilter had his own bodyguard when he became Chancellor of Germany in 1933, it warped into the SS under H. Himmler. Trump is slowly eroding the office of the FBI, the national police force of the United States. He will put his own people that answer only to him and not the Congress or the people of the United States.
2. The TV news showed all his cabinet swearing loyalty to him alone. Not the Constitution, just Donald Trump. (All NAZIs swore allegiance to Adoph Hilter)
3. He is the armed forces Commander in Chief, all armed forces answer to him, and he is putting hardliners in key positions. (All German Officers had to swear loyalty to Hilter)
4. He will eliminate the free press. The internet bill allowing owner of sites to pick and choose their users; giving them the ability to slow or completely stop persons/ideas they don't like.... The attack on free press as "false news". He will eventually have his lawyers tie up the news services that set him in a bad light (those against him). CNN will probably get sued over the Stormy Daniels 60 minutes... (Hilter's NAZIs took over all radio and paper stations by force, giving them the control of the press).
Case in point Cambridge Analytica, and Facebook. Facebook although thought to be a instrument of free expression, is now seen as a stealer of identities, and hence not trustworthy. My thoughts to that is: similar to Murphy's Law "Anything you put on the internet, someone will beg, borrow or steal" for their own benefit.
5. He joked about the President of China, making his office for life, indicating (jokingly or was he serious) that he would like to do that himself. Presidents can only run for 2 terms (4 years for each term), this came into effect in WW2.
6. Under his Administration the US has seen some of the worst clashes between racist and anti-racist groups during rallies/marches.
7. He bankrupted several companies (yet he is a billionaire), where he paid out cents to the dollars to creditors (yet he is still a billionaire). I wonder how close he is to bankrupting America in monetary terms or in his ethics.