Guessing it is actually a combination of very low approval ratings across the board and the fact that the guy who was elected is encouraging distrust in the system.
So if you don't approve of / trust him, you don't trust the government. If you do trust him, you don't trust the government.
The ones who have destroyed the Middle East, armed the syrian terrorists, buried Osama Bin Laden without showing its corpse ( but they showed Gaddafi's one, and he was muslim too, really strange ).
And the same who are spouting nonsense on the "russian hacking" without showing proof.
Seriously, if the american people distrust the government, it is because of the globalist oligarchs puppets actions.
What's relatively new is that now, the President is asking people who are on his side to distrust the rest of the government.
I have a hard time seeing how his team's assertion of "alternative facts" (seemingly designed/delivered to undermine trust in every system we have built for the last 200 years) can lead to anything other than descent into fascism.
As perceived by the media... the same media who wanted the other candidate to be elected.
I don't disagree that the media at large would have preferred the other candidate. That would be true if the media was a perfect statistical representation of the country, and the media is not, it's largely focused in population centers, where the preference was overwhelming.