WASHINGTON — Miles Taylor, who revealed on Wednesday that he was the anonymous author of a New York Times Op-Ed article in 2018 that was critical of President Trump, is a lifelong Republican whose service as a senior Homeland Security official in the Trump administration led him to endorse former Vice President Joseph R. Biden Jr., the Democratic nominee, for president this year.
In the Times essay and in a subsequent book titled “A Warning,” Mr. Taylor anonymously described what he called Mr. Trump’s “amorality,” writing that he witnessed the president’s dysfunctional…
