The thing is though, they could impeach any President for anything. They just need the votes from House of Reps + Senate and they can impeach a President for not wearing the right cuff links.
They are trying to whip the public up into a frenxy so that Dems win 2018 elections and then go for impeachment proceedings, regardless of any wrong doing. Luckily we all see through it and will stomp out this bs(not saying Trump shouldn't be held accountable for things he actually did though).