How would WaPo know?
The question we need to ask whenever a hit piece comes out from the left wing media is to ask your question!
Trump has many enemies within the bowels of the WH that he will have to weed out.
DC always leaks. Look at what just came out about the gag order with the EPA.
There are many that will try to undermine him.
It is going to be a long exhausting process battling everyone coming at him..but he battled to get to the WH. He knows what he is up against.