A pipeline company’s lawsuit against the environmental group could chill free speech, experts said. First Amendment issues are likely to figure prominently in an appeal.

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The previous administration’s progressive lexicon has been swept away, replaced by a new official language of a bureaucracy under fire from its own president.

In a meeting with Meta employees on Thursday, Mr. Zuckerberg also doubled down on recent changes to the company’s online speech policies and ending its diversity initiatives.

The executive order was among several the president signed meant to steer American schools and universities to adopt Republican priorities, such as restricting how schools discuss racism and gender issues.

The University of Tennessee threatened to expel Kimberly Diei over posts the school said were inappropriate. She sued on First Amendment grounds.

A unanimous Supreme Court on Friday upheld a law that effectively bans the wildly popular app TikTok in the United States starting on Sunday, Jan. 19. Adam Liptak, who covers the Supreme Court for The New York Times, explains how free speech and national security collided in this decision.

There is a real risk that the nation’s institutions will succumb to Trump’s campaign of intimidation and not do their jobs.

The justices, who asked tough questions of both sides, showed skepticism toward arguments by lawyers for TikTok and its users.

After visiting President-elect Donald J. Trump in November, Mr. Zuckerberg decided to relax Meta’s speech policies. He asked a small team to carry out his goals within weeks. The repercussions are just beginning.

The justices are expected to rule quickly in the case, which pits national security concerns about China against the First Amendment’s protection of free speech.

The court, which hears arguments on Friday in a challenge to a law banning the app, has issued varying rulings when those two interests clashed.

The social networking giant will stop using third-party fact checkers and instead rely on users to add notes to posts. President-elect Trump and his conservative allies said they were pleased.

Mr. Musk has fallen out with prominent right-wing Americans who say they are worried that their agenda may be sidelined in favor of his own — and that he is willing to silence them on X.

The briefs, filed a week before oral arguments, offered sharply differing accounts of China’s influence over the site and the role of the First Amendment.

President-elect Donald J. Trump’s picks for the F.C.C. and F.T.C. have vowed to remove censorship online. That conflicts with European regulators who are pushing for stricter moderation.

In 2020, he moved to ban the Chinese-owned app. Now, he is opposing the Biden administration’s effort to do just that.

The president-elect took no position on the app’s First Amendment challenge to the law, which sets a Jan. 19 deadline to sell or close the popular platform.

The Supreme Court will hear arguments next month in First Amendment challenges to laws banning the app and shielding minors from sexual materials on the internet.