AALL, ALA, ARL have endorsed the statement. Other groups include ACLU, Authors Guild, Comic Book Legal Defense Fund, and the Freedom to Read Foundation.
From the National Coalition Against Censorship:
NCAC and the American Society of News Editors (ASNE), along with more than 80 other organizations committed to the First Amendment right of freedom of speech and the press, are condemning efforts by the Trump administration to demonize the media and undermine its ability to inform the public about official actions and policies. In a joint statement released on March 2nd 2017, the groups stress that the administration’s attacks on the press pose a threat to American democracy.
The statement cites numerous attempts by the administration to penalize and intimidate the press for coverage the President dislikes, including refusing to answer questions from certain reporters, falsely charging the media with cover-ups and manipulation of news, and denying certain media outlets access to press briefings. Official designation of the media as “the opposition party” escalated when the President described the New York Times, CBS, CNN, ABC, and NBC News as “the enemy of the American people!”