NEW YORK (AP) — National Public Radio has suspended a veteran editor who wrote an outside essay criticizing his employer for, in his view, journalism that reflects a liberal viewpoint with little tolerance for contrary opinions.

Uri Berliner, a senior editor on NPR’s business desk, was suspended five days without pay, according to an article posted Tuesday by NPR’s media correspondent, David Folkenflik. He wrote that Berliner was told he violated the company’s policy that it must approve work done for outside news organizations.

Berliner told NPR that he was not appealing the suspension. An NPR spokeswoman said the company would not comment on individual personnel matters.

He wrote his essay last week for The Free Press. Berliner wrote that NPR has always had a liberal bent, but for most of his 25-year tenure had an open-minded, curious culture.