Donald Trump's Twitter Suggests News Networks Should Have Licences 'Challenged'

Donald Trump appears to have launched a direct challenge to the American First Amendment by asking if news networks he disagrees with should have their licenses “challenged”. 
The President made the dictator-esque suggestion in a tweet in which he claimed organisations running articles he doesn’t like are “bad for the country”.With all of the Fake News coming out of NBC and the Networks, at what point is it appropriate to challenge their License? Bad for countr