Trump is gonna fire whoever does currently have the power to impeach Obama. Somebody is gonna get fired.
In his speech last night in Mass. he is starting to allude to a larger picture of taking back our country.
Consider that all 435 Congress critters and 34 Senators are on the same ballots come next November.
Consider that most, if not all, of the non-presidential primaries and filing dates for those are months after the SEC (Super) Tuesday, SEC Tuesday is March 15. Filing deadlines for federal office applications in Florida is late June. The Florida primary is middle August.
With the current tide of antiestablishmentarianism rising all over the country, and beyond, we have the power to Trump the establishment and fire almost all of them ourselves.
I believe that Trump is fully aware of this and is prepared to pivot onto this angle if he continues to lead and wins big through March.