IRS whistleblowers Gary Shapley and Joseph Ziegler made headlines last year when they alleged that the Department of Justice interfered in an investigation of Hunter Biden.

That led the president's son to file a lawsuit against the IRS, something the tax agency is trying to get dismissed. 

Biden's suit accuses IRS of "engaging in a campaign to publicly smear" him

According to the Washington Examiner, Biden's suit alleges that the two agents made "numerous public appearances and statements that blatantly violated Section 6103 of the Internal Revenue Code by engaging in a campaign to publicly smear Mr. Biden."

They are said to have perpetrated this alleged smear campaign by making private information about the president's son available to the public.

What's more, Biden further contends that the IRS deliberately failed to enact safeguard to protect his information from disclosure.

In response, the IRS submitted a motion on Tuesday which sought to have Biden's lawsuit thrown out on multiple grounds.

IRS points out that Biden already revealed that he was being investigated

The tax agency's filing notes that Biden's suit includes allegations against private attorneys working for Shapley and Ziegler.

What's more, the IRS the motion recalls how it was Biden himself publicly revealed that he was under federal investigation well before the two agents brough their concerns to members of Congress.

Finally, the IRS also pointed out that Biden is attempting to recover damages that are not provided for under privacy law.

Fox News reported last month that Shapley and Ziegler felt vindicated after Special Counsel David Weiss hit Hunter Biden with multiple federal charges.

President's son charged with three felonies and six misdemeanors

"Eight months ago we did something ordinary people don’t do: we risked our careers and reputations to bring the truth out of the shadows and into the light," the men said in a joint statement.

"We were moved solely by our consciences, yet faced continual attacks. Nevertheless, in the face of all odds, we never wavered from what we shared with Congress," they continued.

The whistleblowers went on to describe Weiss' indictment as being "a complete vindication of our thorough investigation" which "underscores the wide agreement by investigators and prosecutors that the evidence supported charges against Hunter Biden."

The president's son was charged on December 7 with a total of three felonies and six misdemeanors in connection with a $1.4 million tax bill which has since been paid off.