The whistleblower’s lawyers Mark Lytle and Tristan Leavitt wrote to Congress that the IRS Criminal Supervisory Special Agent they represent "was informed that he and his entire investigative team are being removed from the ongoing and sensitive investigation of the high-profile, controversial subject about which our client sought to make whistleblower disclosures to Congress. He was informed the change was at the request of the Department of Justice."
They added that they "respectfully request that you [the IRS] give this matter your prompt attention” and that “removing the experienced investigators who have worked this case for years and are now the subject-matter experts is exactly the sort of issue our client intended to blow the whistle on to begin with."