This answer to What are the factors exactly that will make missions like OTV-6 “Space Force launches”? which I've accepted includes the following:
The US Space Force (USSF) is the successor to Air Force Space Command (AFSPC). Because Air Force Space Command was redesignated as Space Force, any projects that were AFSPC are now USSF. It's true that, as I'm writing this, very few people are actually members of the USSF (it might actually be a single person: the Chief of Space Operations). However, there are plenty of people assigned to the USSF: everyone who was assigned to AFSPC is now assigned to the USSF (they just aren't yet members of the USSF while the military figures out who to transfer, who to retrain, and who to keep in the USAF with a space specialty). Civilians work for the Department of the Air Force (which is the parent of both services), so they only need to change their business cards.
That, together with the sentiment behind the question Is the proposal to create a US Space Force being taken seriously? and some of its answers leads me to wonder about post-Trump reversals of recent changes to the US government and military.
As an unqualified observer, it certainly looks to me like the US Space Force would not be difficult to reverse or dissolve within a year if it turns out the administration changes, but I could be missing something.
Question: What would be the political challenges to a potential next administration in 2021 reversing Trump's effort to create a new branch of the US military, and dissolving the Space Force or evolving it to something that would not be considered a distinct branch of the US military?