President Trump touted how crucial his presidency is to the markets' gains, in an interview today with Fox News:
"If I ever got impeached, I think the market would crash. I think everybody would be very poor."
History as guide: Stocks continued to rise during and after Bill Clinton's impeachment, which occurred a bit earlier in a long bull market than where we're at today. Stocks fell when Richard Nixon resigned, but markets were reacting to a confluence of other events like a global oil crisis.