TV news is not about reporting what’s important but what drives more viewers. According to Axios, TV news has seen a substantial drop in viewership recently:

Driving the news: Executives tell Axios that Trump fatigue is very real: Interest in political coverage overall is down, which is spurring investments in other beats, like technology and the global economy.

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By the numbers: Digital demand for Trump-related content (number of article views compared to number of articles written) has dropped 29% between the first 6 months of the Trump presidency and the most recent 6 months, according to data from traffic analytics company Parse.ly.

Source: Trump’s shock factor wears off, causing a slump for the media – Axios
They say the “Trump Bump” effect has run its course across most all media, with drops in both TV and print media.