The chairman of the House Oversight and Government Reform Committee and 20 members of his committee called for the removal the head of the Internal Revenue Service Monday in the wake of new allegations about the agency's alleged targeting of conservatives.

"[John] Koskinen failed in his duty to preserve and produce documentation to this committee," panel chairman Rep. Jason Chaffetz, R-Utah, said. "The IRS failed to comply with a congressional subpoena. The IRS further failed by making false statements to Congress. We will pursue all constitutional remedies at our disposal, including potential contempt proceedings or perhaps impeachment of Commissioner Koskinen."

The committee members pointed to the fact that, under Koskinen's leadership, agency officials destroyed 24,000 emails that were under a congressional subpoena despite an order from the top IRS technology executive not to tamper with those records.

"At best, Commissioner Koskinen was derelict in his duties to preserve agency records," Chaffetz said. "At worst, he and the IRS engaged in an orchestrated plan to hide information from Congress. "

The IRS inspector general revealed the agency had singled out conservative groups applying to be nonprofits for extra scrutiny in May 2013.

In August of that year, the Oversight Committee sent its first subpoena to the IRS for documents related to the targeting scandal.

Koskinen drew fire from congressional investigators after he appeared before the committee last year and promised to produce all emails sent to and from Lois Lerner, the former head of the tax agency's tax-exempt unit.

At the time he said he would produce the records, he was already aware that a hard drive crash had wiped away significant portions of Lerner's emails.

Koskinen dodged questions about the ideological motives of IRS targeting during a House Ways and Means Committee hearing last week.

But a watchdog report issued that same day indicated loopholes in the agency's policy for selecting groups for audit could allow political bias to influence audit decisions.