The revelation that the agency had not audited Donald J. Trump during his first two years in office despite a mandatory presidential audit program raised concerns about potential politicization.
The tax agency said its commissioner asked the Treasury Department’s inspector general for tax administration to look into the audits after The Times raised questions about them.
The former F.B.I. director and his deputy, both of whom former President Donald J. Trump wanted prosecuted, were selected for a rare audit program that the tax agency says is random.