Both. It is about political warfare; worse since the election is over, and the US can consider changes to its laws. However he will need to hand the running of his companies to others.
A US President swears to uphold the Constitution when he or she is inaugurated - not the parts he or she feels are relevant. Until the US amends the Constitution, Trump is expected to abide by it. The US constitution has not been amended. And it is difficult to change the US Constitution.
The notion that it is political warfare to expect the POTUS to stand by his or her word and to abide by the supreme law of the land is ridiculous.