Democrats called on Pai to speak out against the president's call to challenge TV licenses, issued after a report on NBC News that Trump denied.
"With all of the Fake News coming out of NBC and the Networks, at what point is it appropriate to challenge their License? Not fair to public!"
Trump and his supporters have repeatedly used the term "fake news" to cast doubt on media reports critical of his administration, often without providing any evidence to support their case that the reports were untrue.
Trump's tweet comes after NBC News ran a story citing three anonymous USA officials who said Trump wanted to increase the US nuclear arsenal by almost 10 times. Nixon was unhappy with the Washington Post Company and how they were going after his presidency, and they did a damn good job of it, so he chose to have his little acolytes go out there in places like Jacksonville, Florida and Miami, Florida and attempt to get the local news stations there pulled off the air because they were owned by the Washington Post Company.
Comcast Corp, which owns NBC Universal, also owns 11 broadcast stations, including outlets in New York, Washington, Los Angeles, San Francisco, Boston, Dallas and Chicago. Tina Pelkey, an FCC spokeswoman, declined to comment.
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Recon Analytics analyst Roger Entner called the market response a "short-term irrational knee-jerk reaction" and said Trump faced essentially insurmountable hurdles to getting licenses pulled.
Democratic Senator Ed Markey wrote to Federal Communications Commission chairman Ajit Pai on Wednesday, urging him to resist requests from the President to revoke licences because of coverage.
Gordon Smith, the chief executive of the National Association of Broadcasters, defended the media's free speech rights.
The FCC issues licences to owners of television stations, which must be periodically renewed.
Neither NBC or ABC released a statement following the tweet, but others in government stepped in to comment on the issue.
"Fake @NBCNews made up a story that I wanted a "tenfold" increase in our U.S. nuclear arsenal", Mr Trump had tweeted before his threat. I mean, I've seen tremendously dishonest press.