Many tried and did impeach your boy Bill Clinton - did he not go on as if nothing happened and is now drawing a retirement check on our dime...? Anyone want a cigar???????????????????
There are two ways to impeach a president and remove him from office. Only one of them has ever worked.
First way is to let evidence from investigations build a bipartisan and public consensus for impeachment. That’s how Nixon was pushed out of office in 1974. If he had not resigned, he would have absolutely been impeached, and removed from office.
The other way, the historically unsuccessful way, is for just one party to launch impeachment proceedings without bipartisan support, simply because they don't like him, and hope the rest of the country comes along. That’s what Republicans did to Bill Clinton, and it didn’t work. Spectacularly didn't work. Instead, it backfired, making Clinton more popular.
If the Democrats try and impeach Trump, even with the swampy never-Trumpers on the Republican side, unless the country is on board the swamp buggy, it's a virtual certainty to backfire.