0213 GMT September 21, 2018
"A central pillar of President Trump's politics is a sustained assault on the free press," said the editorial by the Boston Globe, which coordinated publication among more than 350 newspapers.
"To label the press 'the enemy of the people' is as un-American as it is dangerous to the civic compact we have shared for more than two centuries," the Globe said.
Each of the newspapers, including some in states that Trump won during the 2016 presidential election, ran an editorial, which is usually an unsigned article that reflects the opinion of an editorial board and is separate from the news and other sections in a paper.
The First Amendment of the US Constitution guarantees freedom of the press.
Trump has frequently criticized journalists and described news reports that contradict his opinion or policy positions as fake news. At a rally in August, Trump described the press covering the event as "fake, fake disgusting news." Trump has made fun of the media by announcing a "fake news awards.” He’s also threatened to enact new libel laws and frequently attacked news outlets via Twitter.
He lashed out again on Thursday, tweeting "THE FAKE NEWS MEDIA IS THE OPPOSITION PARTY. It is very bad for our Great Country....BUT WE ARE WINNING!"
He also wrote there was nothing he would want more for the United States than true freedom of the press, but that much of what the media published was fake news, "pushing a political agenda or just plain trying to hurt people. HONESTY WINS!"
The Republican president's comments reflect a view held by many conservatives that most newspapers and other news outlets distort, make up or omit facts because of a bias against them.
In its editorial, the New York Times said it was correct to criticize the news media for underplaying or overplaying stories or for getting something wrong.
"News reporters and editors are human, and make mistakes. Correcting them is core to our job," the Times said. "But insisting that truths you don't like are 'fake news' is dangerous to the lifeblood of democracy. And calling journalists the 'enemy of the people' is dangerous, period."
The US Senate unanimously adopted a non-binding resolution on Thursday that affirmed the "vital and indispensable role" played by the news media and declared that "the press is not the enemy of the people."
Thursday's coordinated editorials were criticized by some in the media, including a CBS News commentary that described them as a "self-defeating act of journalistic groupthink."
"Seriously — Who's going to be persuaded by this effort, or be impressed that a few hundred newspapers can hum the same tune? Who's even going to notice?" CBS News' commentary asked.
Reuters and NBC News contributed to this story.