It's a video, you can watch & see Comey speak the words himself. I had to click something, so I clicked "Well Sourced" b/c the source is Comey speaking in an interview. Comey is hesitant to make the call, however, probably b/c he got stomped by the mafia mob boss in the White House previously.

A brief intervention that goes straight to the point. Substantially Comey speaking in an interview, but both for the character and for the type of information it results very credible.

Although very brief, the article provides all the necessary video evidence around Comey's comments and does well to let him speak for himself.