‘The Presidential oath, which the framers of the Fourteenth Amendment surely knew, requires the President to swear to ‘preserve, protect and defend’ the Constitution — not to ‘support’ the Constitution,’ read a filing from the former president’s attorneys
Its one of those 'If not one then the other' things.
If you aren't foreign, you are domestic. If you aren't domestic, you are foreign.
There are dual citizens, in which case the enemy is foreign and domestic.