Mr. Taylor, whose criticisms of President Trump in a New York Times Op-Ed article and subsequent book roiled Washington and infuriated Mr. Trump, resigned from the administration last year and endorsed Joe Biden this summer.
Miles Taylor, the former chief of staff at the Department of Homeland Security, was the anonymous author of The New York Times Op-Ed article in 2018 whose description of President Trump as “impetuous, adversarial, petty and ineffective” roiled Washington and set off a hunt for his identity, Mr. Taylor confirmed Wednesday.
Mr. Taylor was also the anonymous author of “A Warning,” a book he wrote the following year that described the president as an “undisciplined” and “amoral” leader whose abuse of power threatened the foundations of American democracy. He acknowledged that he was the author of both the book and the opinion article in an interview and in a three-page statement he posted online.
Mr. Taylor resigned from the Department of Homeland Security in June 2019, and went public with his criticism of Mr. Trump this past summer. He released a video just before the start of the Republican National Convention declaring that the president was unfit for office, and he endorsed Joseph R. Biden Jr., the Democratic presidential nominee.