Federal investigators from the D.C. U.S. Attorney's office recently interviewed former FBI director James Comey as part of an ongoing probe into whether former FBI #2 Andrew McCabe broke the law when he lied to federal agents, reports the Washington Post.

Investigators from the D.C. U.S. Attorney’s Office recently interviewed former FBI director James B. Comey as part of a probe into whether his deputy, Andrew McCabe, broke the law by lying to federal agents — an indication the office is seriously considering whether McCabe should be charged with a crime, a person familiar with the matter said. -Washington Post

What makes the interview particularly interesting is that Comey and McCabe have given conflicting reports over the events leading up to McCabe's firing, with Comey calling his former deputy a liar in an April appearance on The View. 

Justice Department Inspector General Michael Horowitz issued a criminal referral for McCabe following a months-long probe which found that the former acting FBI Director leaked a self-serving story to the press and then lied about it under oath. McCabe was fired on March 16 after Horowitz found that he "had made an unauthorized disclosure to the news media and lacked candor - including under oath - on multiple occasions." 

Specifically, McCabe was fired for lying about authorizing an F.B.I. spokesman and attorney to tell Devlin Barrett of the Wall St. Journal - just days before the 2016 election, that the FBI had not put the brakes on a separate investigation into the Clinton Foundation, at a time in which McCabe was coming under fire for his wife taking a $467,500 campaign contribution from Clinton proxy pal, Terry McAuliffe. 

The WSJ article  reads:

New details show that senior law-enforcement officials repeatedly voiced skepticism of the strength of the evidence in a bureau investigation of the Clinton Foundation, sought to condense what was at times a sprawling cross-country effort, and, according to some people familiar with the matter, told agents to limit their pursuit of the case. The probe of the foundation began more than a year ago to determine whether financial crimes or influence peddling occurred related to the charity.

...

Some investigators grew frustrated, viewing FBI leadership as uninterested in probing the charity, these people said. Others involved disagreed sharply, defending FBI bosses and saying Mr. McCabe in particular was caught between an increasingly acrimonious fight for control between the Justice Department and FBI agents pursuing the Clinton Foundation case.

So McCabe was found to have leaked information to the WSJ in order to combat rumors that Clinton had indirectly bribed him to back off the Clinton Foundation investigation, and then lied about it four times to the DOJ and FBI, including twice under oath. 

McCabe vs. Comey

Investigators from the D.C. U.S. Attorney's office were likely to be keenly interested in Comey's version...