I'm not pushing impeachment due to the simple fact that there are not 67 votes to convict in the Senate as of now. It would be just be political theater, not that both parties have not been guilty of that.. I do believe Trump is concerned, if not scared about a subpoena. There are indications from the DC Circuit Court that someone nameless but very high up has been or is going to be subpoenaed soon after Tues.
It isn't just anyone bc everything has been expedited way faster than a "normal" case and there is a lot of cloak and dagger stuff and tight lips.
It could be someone else, Roger Stone or Don Jr. but IMO it's higher than that..
We shall see when Mueller's report is issued, if not in Nov. likely before the end of the year. Anyone who would enter a Civil War over one individual, especially if it is proven Trump has committed felonies, it is my opinion it would have happened anyway.
It would be better for the country for him to resign ala Nixon if that happens rather than an impeachment process.
If he is exonerated, I won't lose any sleep over it, there won't be an impeachment because then the 2020 election cycle would be upon us. I predict he will be subpoenaed, time will tell.