He could dispute McCabe’s claim or perhaps argue that being aware of an anonymous source is not the same as authorizing someone to be an anonymous source or being an anonymous source. McCabe did say that he was “one of only a few people who had the authority” to share information with the media, suggesting that he would not have needed Comey’s permission.

There is room for Comey to contend that both he and McCabe told the truth, but his answers to Grassley’s questions could still be regarded as less than forthcoming.

In any case, Comey’s effort to square his testimony with McCabe’s statement is something to watch for.