Two Republicans are calling on President Obama to fire the head of the IRS.

Reps. Ron Desantis of Florida and Jim Jordan of Ohio told Obama to fire Internal Revenue Service Commissioner John Koskinen or they would impeach Koskinen themselves.

The lawmakers made the demand in an op-ed in the Wall Street Journal Monday. Their appeal was published at the same time as House Committee Chairman Jason Chafftez, R-Utah, penned a letter to Obama also asking for Koskinen's removal through "work[ing] hand-in-hand with Congress to fix the problem."

"Commissioner Koskinen … has failed the American people by frustrating Congress's attempts to ascertain the truth. A taxpayer would never get away with treating an IRS audit the way that IRS officials have treated the congressional investigation. Civil officers like Mr. Koskinen have historically been held to a higher standard than private citizens because they have fiduciary obligations to the public," Desantis and Jordan wrote.

The lawmakers are unhappy with the way Koskinen handled the IRS in the wake of the 2013 IRS targeting scandal, in which critics charge that the IRS purposefully focused excessive scrutiny on conservative groups seeking tax-exempt status. While he was brought in to deal with the consequences of the breach after the previous IRS commissioner was fired, the lawmakers wrote that Koskinen had broken his "basic fiduciary duties" during his time in office.

The duo noted the IRS head's handling of the Lois Lerner emails as a prime example of his need for replacement. They highlighted the fact that the IRS had deleted backup tapes that had recorded thousands of Lerner emails pertaining to her part in the targeting scandal. The deletions came after a preservation order was sent to employees. Koskinen later testified under oath, but failed to mention the "gap" in Lerner's emails.

Desantis and Jordan also called some of Koskinen's congressional testimony "categorically false" and accused the IRS commissioner of failing to amend false statements and not creating safeguards in the organization that would prevent similar tax-exempt targeting in the future.

"The targeting of conservative groups may very well continue," they wrote.

The team threatened that should Obama not remove Koskinen, Congress would take it upon itself through impeachment.

Jordan told the Washington Free Beacon earlier this month that he was looking for ways to impeach Koskinen via the House.

"When you have an individual who's head of an agency with this kind of power the Internal Revenue Service has, who has stated things under oath that turned out later to be false, that's a problem," he said.

"Couple that with the false information that was sent out to a lot of Obamacare enrollees that impacted their tax liability that was just false, and some of the data breaches that have taken place there too — so the main focus is, of course, the targeting scandal and his answers to questions in front of the committee under oath that I've said later turned out to be untrue."