“His DUTY is to uphold his sworn oath”
Part of his oath is to protect the country.
The President doesn’t have to sit there with his thumb up his butt and wait for congress to give him permission to protect the country.
Yes, the President DOES have to sit with his thumb up his butt unless and until either Congress gives him the go-ahead according to Article I Section 8 or a State requests assistance under Article IV, Section 4.
Thinking a President can take action just because HE thinks it's necessary is absolutely ludicrous.
Anyone who thinks the Office of POTUS has that authority has NO understanding of the Constitution, and no viable reason to call himself a 'conservative'.
Those who give up essential liberties for temporary safety deserve neither liberty nor safety.
~Benjamin Franklin