The Constitution says otherwise.
1. Don't try to argue with a lawyer, for they are trained to argue either side.
2. The Constitution says "high crimes and misdemeanors," so presumably Congress would need to demonstrate they argued it from that basis; e.g. the constitution, not merely politics.
IMO however talk of impeachment, it SOLELY to delay, and block enactment of conservative measure. A smokescreen, a distraction.
It appears the GOP establishment are letting outsider Trump, "dangle in the wind." I believe many of them feel enactment of conservative measures, will not be widely accepted by voters.
--Cutting welfare, food stamps, health coverages, federal spending in general, curtailing illegal immigration, ramping up defense spending, etc.
IOW mostly things which many Republicans also talk out of both sides, of their mouths about.