A 14-year IRS veteran has gone public as a whistleblower who is accusing the Justice Department of showing preferential treatment in a high-profile tax investigation.

In an interview with “CBS Evening News” that aired Wednesday, Gary Shapley, a supervisory special agent, said tax secrecy laws prevent him from publicly disclosing who the subject of the investigation is, but CBS News and CNN reported the probe centers on Hunter Biden, the son of President Joe Biden.

Shapley said he was assigned to the investigation in January 2020, which is being led by the Trump-appointed U.S. attorney in Delaware, David Weiss.

“When I took control of this particular investigation, I immediately saw it was way outside the norm of what what I've experienced in the past,” Shapley told CBS News. “There was multiple steps that were slow-walked at the direction of Department of Justice.”

He alleged that every deviation from normal process “seemed to always benefit the subject.”

Shapley is seeking legal protection from Congress as a whistleblower so he can go into detail about his allegations. He is scheduled to meet behind closed doors Friday with the Republican-led House Ways and Means Committee.

Shapley said he decided to sound the alarm about the investigation after a heated meeting in October with federal prosecutors, which he called a “red line.”

“It just got to that point where that switch was turned on, and I just couldn’t silence my conscience anymore,” Shapley said.

“I don't want to do any of this,” he said. “I took the oath of office, and when I saw the egregiousness of some of these things, it no longer became a choice for me. It's not something that I want to do. It’s something that I feel like I have to do.”

Shapley said he is a registered Republican. His whistle blowing is being assisted by an advocacy group with past ties to the GOP, CBS News reported.

The U.S. Attorney’s Office in Delaware declined to comment Thursday morning.

The Justice Department did not immediately respond to a request for comment from Spectrum News; it declined to comment to CBS News.

The IRS told CBS News it cannot comment on specific cases but said it is committed to supporting whistleblowers.

The Justice Department launched the investigation into Hunter Biden’s taxes and foreign business dealings in 2018. No charges have been filed to date.

The White House has repeatedly insisted it does not get involved in Justice Department investigations. And in in March, Attorney General Merrick Garland testified before the Senate Judiciary Committee that he’s staying out of the Hunter Biden probe, leaving the matter to Weiss.

Hunter Biden has previously said he handled his business affairs “legally and appropriately.”