Impeachment is the only (?) way for the people to hold the US President accountable for his actions while in office.
As someone that remembers (dimly, getting old
) the Clinton impeachment and the investigation by special council Starr, I must say that in my mind what the Muller report shows is far, far worse. While I thought Clinton was a sleaz having sex with an intern, I never ever suspected him of colluding or being beholden to a hostile foreign power, in addition to obstruction of investigation of said hostile foreign power's interference in US elections. In fact, I never thought I'd see that day of
any US President.
Edit: The 2018 Trump-Putin summit press conference in Helsinki was jaw dropping.