Federal Trade Commission Chairman Andrew Ferguson has accused Apple of violating US law by suppressing conservative-leaning news outlets on Apple News.

Ferguson pointed to research by a pro-Trump group that accused Apple News of suppressing articles by Fox News, the New York Post, Daily Mail, Breitbart, and The Gateway Pundit. The FTC chair claims that Apple News might be violating promises made to consumers in its terms of service, but his letter doesn’t cite any specific provisions from the Apple terms that might have been violated.

“Recently, there have been reports that Apple News has systematically promoted news articles from left-wing news outlets and suppressed news articles from more conservative publications,” Ferguson wrote in the letter to Apple CEO Tim Cook yesterday. He said the “reports raise serious questions about whether Apple News is acting in accordance with its terms of service and its representations to consumers, as well as the reasonable consumer expectations of the tens of millions of Americans who use Apple News.”

Craig Aaron, president and co-CEO of media advocacy group Free Press, told Ars that Ferguson’s “letter would be laughable if it weren’t so dangerous. This is what government censorship looks like. Ferguson’s claims of course aren’t based on any facts or evidence, just innuendo from discredited partisan operatives who think The Wall Street Journal is too woke. Just imagine if another administration had told Drudge or Fox News what stories they should feature on their apps or home pages.”

Ferguson told Cook, “As an American citizen, I abhor and condemn any attempt to censor content for ideological reasons. Such efforts, whether taken to appease overzealous activists, at the behest of foreign governments, or simply to advance the political views of Silicon Valley elites, stifle the free exchange of ideas, manipulate the public discourse, and are inconsistent with American values.”

We contacted Apple about Ferguson’s letter and will update this article if it provides a response. Aaron said that “Apple must respond and condemn this government intrusion. Capitulating to or appeasing government censors will never work. If these companies are as committed to free expression as they claim to be, it’s time to take a stand.”