Lawyers representing the IRS official claim that their client, who raised concerns about the alleged corruption and political influence in the criminal investigation into Hunter Biden, is being removed from the inquiry in what appears to be an act of retaliation.

According to attorneys representing the IRS official, they have notified Congress that their client, a criminal supervisory special agent, has been 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,” according to The New York Post.

Mark Lytle and Tristan Leavitt, the IRS agent’s attorneys, said their client was “informed the change was at the request of the Department of Justice.” They also noted that the “move is clearly retaliatory and may also constitute obstruction of a congressional inquiry.”

FBI and IRS investigators have been conducting a years-long investigation into Hunter Biden’s business dealings and tax affairs. Following a meeting between Biden’s lawyers and Department of Justice officials, there are indications that potential charges related to tax and gun-related crimes may be forthcoming from Delaware’s U.S. Attorney David Weiss, the Washington Post reported earlier this month.

Hunter Biden has said he expects to be cleared of any illegal activity, and his father, President Joe Biden, told MSNBC this month that his son has “done nothing wrong.”

According to CNN, the IRS supervisory agent, whose identity remains undisclosed, recently made contact with top lawmakers to discuss protected whistleblower disclosures related to a high-profile investigation, which has been linked to the Hunter Biden probe. Lawyers representing the IRS agent subsequently met with congressional investigators, potentially paving the way for a formal disclosure involving sensitive tax information in the coming days, the reports said.

Lytle has said that his client has already passed along information to several agency inspectors general, including “examples of preferential treatment and politics improperly infecting decisions,” a “failure to mitigate clear conflicts of interest in the ultimate disposition of the case,” and claims that “contradict sworn testimony to Congress by a senior political appointee.”

Lytle also told CBS News that his client has materials that include emails and other communications to support his claims.

The senior official mentioned in Lytle’s letter to Congress has been identified as Attorney General Merrick Garland. During his testimony before the Senate Judiciary Committee in March, Garland briefly addressed the inquiry, stating, “I pledged not to interfere with that investigation and I have carried through on my pledge.”

Pressed recently about the IRS whistleblower as well as his testimony during a press conference, the AG said his remarks under oath remain true. “Yes, it’s still the case,” Garland said. “I stand by my testimony, and I refer you to the U.S. attorney for the District of Delaware, who is in charge of this case and capable of making any decisions that he feels are appropriate.”