The "mainstream media television networks" are really screwed up for refusing to air an ad touting Trump's first 100 days. I agree with the Trump campaign when they said that the "mainstream media are champions of the First Amendment only when it serves their own political views."
Reports say that CNN, ABC, CBS, and NBC all turned that the proposed paid advertisement. Reportedly, NBC called it “fake news.”
The ad apparently doesn't fit a "biased narrative" of the networks.