Many news organizations happily threw out their journalistic integrity to "fight Trump". Honest reporting became taboo. You were either FOR or AGAINST Trump, and anyone not choosing a side was just secretly on the other side.
Trump was a birther FFS. He was part of that lovely group of people who thought Obama was the antichrist for wearing a tan suit or eating arugula. He made media worse, not the other way around. They sullied themselves by pandering to his and his supporters' insanity. This happened way before he became president.