Facebook has taken down articles posted by the far-right site Breitbart that purported to identify the whistle-blower who triggered the impeachment inquiry of President Trump, just two weeks after including the site in the lineup of publishers whose work would be featured in a new news product.

The president and his supporters have argued that the whistle-blower should be identified because, they say, his revelations about a phone call between Mr. Trump and the president of Ukraine were politically motivated. But others have urged the protection of his anonymity, citing his safety and deference to whistle-blower statutes, which are designed to encourage people to bring information to light in the public interest.

[Related: Whistle-blower’s name keeps evading Facebook and YouTube defenses.]

In an article on Friday, Breitbart said its posts naming the person were taken down on Wednesday. Facebook said it was taking down any mention of the name throughout the platform, regardless of the source.

“Any mention of the potential whistle-blower’s name violates our coordinating harm policy, which prohibits content ‘outing of witness, informant or activist,’” a Facebook spokeswoman said in an emailed statement. “We are removing any and all mentions of the potential whistle-blower’s name and will revisit this decision should their name be widely published in the media or used by public figures in debate.”