Impeachment is a political event, not subject to normal trial rules. Pleading the Fifth can be used against him.
They will not have the senate seats to remove him.
Trump needs to attack Mueller and Uranium One.
They buried Russian felonies that should have kabashed the deal.
Mueller, Rosenstein and Holder.
Trump needs to diminish this fraud and put him on the defensive. Let the public see what he has done.
When in doubt, ATTACK!