Andrew Johnson was trying to keep the Radical Republican kooks taking over the whole government and removing the Constitutional authority of the President. Plus, they were politicizing Reconstruction. He was not removed from office. Clinton was trapped by Starr investigation when asked under oath about an adulterous affair. He did what husbands have done for 1,000 years when busted cheating on their wives. He lied. Public found Clinton impeachment was a example of partisan politics gone too far. His approval was at 60% during impeachment. Many historians agree that had Lincoln not been assassinated the Radical Republicans would have impeached him. Lincoln did not agree with their proposed plan of action. It was after Lincoln’s death that he become defied. I don’t like frivolous impeachment’s. Democrats would be smart to back off such talk. We can’t go around trying to overturn elections because you don’t like the results.
The History Place - Presidential Impeachment Proceedings
There is more than enough valid reason to impeach Trump - more than they had on either Clinton or Johnson., and once they get a hold of his tax returns, they'll be a mountain more on top of that.
They fact is:
The Dems DO NOT WANT to impeach Trump!
They desperately want to run against him in 2020. They just want plenty of political ammunition against him - then they'll let the voters decide.
If they play their cards right the Dems will control all 3 branches of government with a super majority in the Senate.
Of course, they WON'T play their cards right. They'll nominate someone that has no chance of winning the general election - someone as bad as Trump himself - like they did in the 2016 election.