(CNN) -

An IRS employee has been suspended for "repeatedly" trying to convince callers to a customer service help line to re-elect President Barack Obama in 2012.

The Office of Special Counsel, which handles whistle blower complaints, said the employee, whose name was not released, delivered a "chant based on the spelling of the employee's last name."

The agency said the "employee acknowledged that he had used his authority and influence as an IRS customer service representative for a political purpose and did so while at work."

He agreed to a 100-day unpaid suspension for violating a law that prohibits federal employees from engaging in political activities, like fund-raising or promoting candidates.

The IRS has come under fire for its past targeting of conservative groups in assessing their applications for tax-exempt status.