Treasury Spokesman Anthony Coley said his department would "fully support the IRS Inspector General's review of this matter."
"The Treasury Department expects all individuals and organizations to be treated fairly by the IRS. Anything less is inappropriate and unacceptable," Coley said.
Jay Carney, President Barack Obama's press secretary, said Friday the IRS' actions were "inappropriate."
"We would fully expect the investigation to be thorough and for corrections to be made in a case like this," Carney continued. "And I believe the IRS has addressed that and has taken some action, and there's an investigation ongoing."
Of the 300 groups that were filed for further review, 130 have been approved, 180 are still in process and about 25 are under review, Lerner said.
Asked when the IRS began looking into complaints, Lerner said she could not give a time frame. Pressed further on when senior IRS officials became aware of the situation, Lerner said she "did not feel comfortable answering."
Lerner said they have implemented changes to prevent similar mistakes in the future. When asked if there has been disciplinary action, Lerner said "No." Attempting to clarify later, she said she meant to say she wouldn't comment on personnel issues.