History teaches that democrats will always try the impeachment routine when republicans fail to present a united front and fully support a republican president, like night follows day.
It's a smokescreen. It's their trump card. As the media focus started to shift to Hillary's very real crimes, up to and including questions of selling strategically important resources to a potential enemy for fun and profit, the Dems have whipped out the "Impeachment" kerfuffle to take the heat off the Uranium One investigation.
It's a distraction and if Republicans will ignore it and just say "No way. Now about Hillary...", and the corruption at the DOJ, and move on with their eyes on the prize (and prosecute), they won't get their asses handed to them.