He lied to the IG about how he leaked information to the press. Hopefully, they decide to prosecute and then they can press him to flip on the others.
Via Fox News:
Federal prosecutors have impaneled a grand jury to investigate former FBI Deputy Director Andrew McCabe following the Department of Justice inspector general’s report alleging that McCabe approved a media disclosure to advance his personal interests.
The Washington Post reported that the grand jury has summoned more than one witness and the case is still underway. It remains unclear who were summoned to testify.
The existence of the panel indicates that the authorities are treating McCabe’s actions during his time at the FBI seriously and may even press charges if sufficient evidence is found. The grand jury is often used as an investigative tool to gather evidence, though it may not necessarily lead to charges.