And Obama picked a fight with Fox News early in his Presidency and learned the truth in the old axiom never pick a fight with somebody who buys ink by the barrel. I know folks here this Fox News is "fair and balanced", but CNN is just getting warmed up if they want to be to Trump what Fox News was to Obama over the length of his Presidency.
And if it's "petty" from their end - Isn't it just as "petty" of Trump to keep carrying on his great crusade against CNN when Buzzfeed released the files not CNN. And CNN just covered the release sort of like how Drudge would release something, or Brietbart would write an article on something and then Fox News would cover it as "it's being reported..." or "some people are saying...".
I'd much rather have a petty news outlet than a petty President. Because the network can be marginalized with cold professionalism ( No interviews, one press conference question with a quick answer and move on sorta deal) not to mention many other news outlets to watch on the viewer end whereas there is only one President with all the power and the nuke codes.