First, I'm asking this question in general to address those calling for impeachment without any comment about whether an impeachment should/would happen etc. I just want to speak to how possible/impossible an actual removal from office is, if those calling for an impeachment were to get their way in such a hypothetical situation.
Right now (as of Feb 13 2017) I don't think Trump has done anything that has any realistic chance of impeachment occurring, but anti-Trump individuals keep speculating to issues they feel will inevitably occur. I've heard of a few such claims, most common seems to be issues with Trump abusing his presidency to help his businesses. So, I am wondering about this sort of hypothetical situation where Trump has done something, without speculating what exactly, to further alienate/upset Congress, enough to lead to impeachment hearings happening. How badly would this hypothetical something have to be that he would have a realistic chance of being removed from office?
Since past impeachments (all two of them!) seemed to involve votes following party lines, for these sorts of votes lets say in this hypothetical impeachment almost every Democrat voted for removal, what is the number of people left that would need to vote 'against' party lines (or with the Democrats in the case of Independents or third party candidates), and frankly how severely would Trump had to have #@%$ up to have alienated so many Republicans?
For example, if something happened to alienate all the Independents and those Republicans who had previously renounced or spoken out against Trump when he was running against Clinton, how many votes would that be for removal and how many of the rest of the remaining Republican base would still have to be alienated to reach the 2/3 number?
How many 'hard right' Republicans, Tea Party members and the like, that are unlikely to ever vote against Trump in impeachment hearings are there? What percentage of the remaining Republicans, who didn't denounce Trump but theoretically could vote against him if a severe enough incident were to come to light, would that leave that need to vote against Trump?
I know his VP is a very hard-right-leaning Republican, so I wonder if this affects the likely outcome. Would Republicans be more inclined to vote against Trump to get a VP with strong right leanings if Trump doesn't stick to Republican doctrine etc?
Even harder to speculate, but if we theorized a situation after the next election where Democrats had the majority, let's say around the level when Obama took office, before the impeachment happened. How would that affect the number of Republicans that would have to vote against party lines?