WASHINGTON — Congressional investigators say they uncovered e-mails Wednesday showing that a former Internal Revenue Service official at the heart of the tea party investigation sought an audit involving a Republican senator in 2012.
The e-mails show former IRS official Lois Lerner mistakenly received an invitation to an event that was meant to go to Sen. Charles Grassley, R-Iowa.
The event organizer apparently offered to pay for Grassley’s wife to attend the event. In an e-mail to another IRS official, Lerner suggests referring the matter for an audit, saying it might be inappropriate for the group to pay for his wife.
‘‘Perhaps we should refer to exam?’’ Lerner wrote.
It was unclear from the e-mails whether Lerner was suggesting that Grassley or the group be audited — or both.
The other IRS official, Matthew Giuliano, waved her off, saying an audit would be premature because Grassley hadn’t even accepted the invitation.
‘‘It would be Grassley who would need to report the income,’’ Giuliano said.
The name of the event organizer was blacked out on copies of the e-mails released by the House Ways and Means Committee because they were considered confidential taxpayer information. Grassley and his wife signed waivers allowing their names to be released.
In a statement, Grassley’s office said the senator did not attend the event, and did not receive any invitation intended for Lerner.
‘‘This kind of thing fuels the deep concerns many people have about political targeting by the IRS and by officials at the highest levels,’’ Grassley said. ‘‘It’s very troubling that a simple clerical mix-up could get a taxpayer immediately referred for an IRS exam without any due diligence from agency officials.’’
The IRS said in a statement that it could not comment on the specifics of the case ‘‘due to taxpayer confidentiality provisions.’’
‘‘As a general matter, the IRS has checks and balances in place to ensure the fairness and integrity of the audit process,’’ the IRS statement said. ‘‘Audits cannot be initiated solely by personal requests or suggestions by any one individual inside the IRS.’’
The IRS says it has lost an untold numbers of Lerner’s e-mails because her computer crashed in 2011, sparking outrage among Republican lawmakers who have accused the tax agency of a cover-up. The e-mails released Wednesday were among the thousands that have been turned over to congressional investigators.
‘‘We have seen a lot of unbelievable things in this investigation, but the fact that Lois Lerner attempted to initiate an apparently baseless IRS examination against a sitting Republican United States senator is shocking,’’ Rep. Dave Camp, R-Mich., chairman of the Ways and Means Committee, said. ‘‘At every turn, Lerner was using the IRS as a tool for political purposes in defiance of taxpayer rights.’’
Lerner headed the IRS division that processes applications for tax-exempt status. The IRS has acknowledged that agents improperly scrutinized applications by tea party and other conservative groups before the 2010 and 2012 elections. Documents show that some liberal groups were singled out, too.
Grassley had been an outspoken critic of the way the IRS policed tax-exempt groups even before the tea party controversy erupted last year.
In one e-mail, Lerner indicates that she won’t attend the event.
‘‘Don’t think I want to be on the stage with Grassley on this issue,’’ she wrote.
Ways and Means is one of three congressional committees investigating the way the IRS processed applications for tax-exempt status. The Justice Department is also investigating.
Also Wednesday, a group of Republican senators — including Grassley — said they want to expand a Senate investigation to look more closely at how the agency lost the e-mails.
Republican members of the Senate Finance Committee said they want know why the Treasury Department and the White House were told about the lost e-mails more than a month before Congress was told. They have asked committee chairman Ron Wyden, D-Ore., to schedule a hearing with IRS Commissioner John Koskinen.
Wyden’s office was noncommittal Wednesday, saying he hadn’t seen the request.
The Republicans, led by Sen. Orrin Hatch of Utah, are also asking the Treasury and Justice departments, and the Federal Election Commission, to turn over any e-mails they might have from Lerner.
‘‘The IRS’ failure to inform the committee months or even weeks ago about the missing e-mails raises serious questions about its commitment to cooperate with this investigation,’’ the letter said.
In testimony before a House panel this week, Koskinen said the IRS waited to tell Congress until officials knew the full extent of the e-mail loss.
Koskinen said the Treasury Department has agreed to turn over e-mails it has from Lerner. The White House said last week it has found no e-mails between anyone in the executive office of the president and Lerner.
At the time of Lerner’s computer crash in June 2011 the IRS had a policy of backing up e-mails on computer tapes, but the tapes were recycled every six months, Koskinen said. He said Lerner’s hard drive was recycled and presumably destroyed.
The IRS was able to generate 24,000 Lerner e-mails from the 2009 to 2011 period because she had copied in other IRS employees. Overall, the IRS said it was producing a total of 67,000 e-mails to and from Lerner, covering the period from 2009 to 2013.