(A). The problem of major "news" networks acting as influencers rather than reporters of events (with a legitimate right to assert opinions, when clearly labeled as such) is one that deserves attention. The First Amendment, despite Leftist bizarre claims, does NOT give an unrestricted right to say or publish anything you want.
(B). It is positively bizarre when Leftists screech about Trump's "threats" to use expansive Presidential power, when they have expanded Congressional powers beyond not only the words of Article I, but beyond any rational extension thereof.
(C). The decade-long slander campaign against Trump is so engrained in the Media culture that it goes unnoticed by most of the news-consuming public.
No, it is not slander if it is true:
Truth is a complete defense
In the United States, truth is a complete defense to defamation claims, including slander and libel. This means that if you are accused of defamation, slander, or libel, and you can prove that what you said was true, there is no case.