NPR has suspended Uri Berliner, the senior editor who published a bombshell essay a week ago that claimed that the publicly funded outlet has “lost America’s trust” by approaching news stories with a left-wing bias.

NPR media writer David Folkenflik revealed on Tuesday that Berliner beginning on Friday was suspended for five days without pay. Folkenflik, who reviewed a copy of the letter from NPR brass, said that the company told the editor he had failed to secure its approval for outside work for other news outlets — a requirement of NPR journalists.

NPR called the letter a “final warning,” saying Berliner would be fired if he violated NPR’s policy again.

Neither NPR nor Berliner immediately responded to requests for comment.