WASHINGTON (AP) — A former Trump administration official who penned a scathing anti-Trump op-ed and book under the pen name “Anonymous” is making his identify public.

Miles Taylor, a former chief of staff at the Department of Homeland Security says in a tweet: “Donald Trump is a man without character. It’s why I wrote ‘A Warning'”.

Donald Trump is a man without character. It’s why I wrote “A Warning”…and it’s why me & my colleagues have spoken out against him (in our own names) for months. It’s time for everyone to step out of the shadows. My statement: https://t.co/yuhTgZ4bkq

— Miles Taylor (@MilesTaylorUSA) October 28, 2020

Taylor has been an outspoken critic of Trump’s in recent months, and he has a contributor contract on CNN.

Taylor’s anonymous essay was published in 2018 by The New York Times, infuriating the president and setting off a frantic White House leak investigation to try to unmask the author.