As Nancy Pelosi and House Democrats weigh the potential electoral risks of beginning impeachment proceedings, they must also consider the risks of not doing so.
As Democrats weigh the benefits of impeachment following the release of the Mueller report, here's what history says about the arguments for or against proceeding.
To gain a historical perspective on how Trump and his closest allies might react if the Mueller report proves damning, one only needs to look as far back as 1974.