This is part of a series about the overall declining trust in media, news, and society as a whole.
The goal of this piece is to demonstrate the size, change over time, and depth of the issue through various charts. You can make your own conclusions.
1. The decline is not limited to the USA
China is an exception as you can see, but I cover that here.
2. The overall trend does not care which president is in office.
3. By Political Party
The next obvious question is, whether it affects a one or both political parties. Of course, the trend switches someone each time a new party replaces the old, but the overall trend is still clear.
Realize that this trend is part of a much larger one (see link at the top).