Three prominent journalists at CNN resigned on Monday after the cable news network was forced to retract and apologize for a story on its website involving a close ally of President Trump.

The article — linking Anthony Scaramucci, a hedge-fund manager and Trump confidant, to a Russian investment fund supposedly being investigated by the Senate — was removed from CNN.com late last week after the network decided it could not fully stand by its reporting.

The resignations are a black eye at a sensitive moment for the news organization, which has emerged as a regular target of Mr. Trump and his supporters. The president relishes dismissing the network’s coverage as “fake news,” and his closest advisers have accused the channel of harboring a bias against Mr. Trump.