President Trump launched another attack on the media on Tuesday , tweeting to his 40.7 million followers that "fiction writers" are putting out "fake news," naming NBC, CBS, ABC and CNN specifically.

"So much Fake News being put in dying magazines and newspapers," Trump tweeted Tuesday afternoon. "Only place worse may be @NBCNews, @CBSNews, @ABC and @CNN. Fiction writers!"

So much Fake News being put in dying magazines and newspapers. Only place worse may be @NBCNews, @CBSNews, @ABC and @CNN. Fiction writers! — Donald J. Trump (@realDonaldTrump) October 17, 2017

It's not clear what specific report, if any, the president was responding to.