A top investigative journalist who promoted information from the so-called “Trump dossier” that claimed Donald Trump’s 2016 presidential campaign colluded with Russia now says the media should have approached the document with “more skepticism.”

“I think it’s fair to say that all of us should have approached this, in retrospect, with more skepticism, particularly when we didn’t know where it was coming from,” Michael Isikoff, chief investigative correspondent for Yahoo News, told Vanity Fair. “We knew that Steele compiled it, but that Steele did not hear these allegations himself. Somebody else heard them from others and then passed them along. That’s thirdhand stuff, which is not usually the kind you want for publishing.”