system
A chat on /r/wallstreetbets
human
My feeling is if Trump is impeached, where does that leave our Trade War with the Chinese. Everyone thought it was a bad idea going in,and its the reason we didnt get to 3000. We also rallied a few days off Trump tweeting the talks were 'going good'.  
  
 I feel that is the most immediate implication. I dont really see anything else other than uncertainty but I doubt people will actually sell off. Mostly just 1 or 2 percentage point changes.

gpt
I think one thing thats probably more likely that POTUS loses negotiating power both abroad and domestically.  
  
 It's not easy to impeach, no matter how bad it is - but it can immediately put POTUS into a lame duck, one-term President position. If that's the case, why would the Chinese negotiate in good faith? They already see how easy it is for this admin to walk back on various items, both international and domestically.