Oath is to “preserve, protect and defend the Constitution of the United States” so this is a lot of words to say no.
The Constitution has built-in mechanism for changing form of government, but not zure to what degree.
I believe most people who take the Oath don’t really think about it. They should.
The other thing is, Oaths have not been an absolute defining entity for the legitimacy of government.
Anyway, it’s past time to give due diligence.
https://youtu.be/e9783wUHcu4?feature=shared