In the increasingly bitter legal standoff between President Donald Trump and media outlets whose reporting he dislikes, a new and crucial third party has emerged: citizens who watch and read the news and need it to do their jobs.

A lawsuit filed Monday on behalf of six such citizens — essentially representing the public audience writ large — argues that it’s not only the rights of news organizations that are violated when Trump bans them from White House premises. Even more fundamentally, the lawsuit argues, such bans violate the public’s right to independent reporting about its president and government.

“The ultimate injury here … is to the democratic public,” says the suit, filed in federal district court in New York against Trump and three key aides, including the White House chief of staff, Susie Wiles.

“The First Amendment protects the public’s right to know what its government is doing,” said Katie Fallow, deputy litigation director at the Knight First Amendment Institute, which filed the lawsuit on…