(Washington Times) A federal inspector general is looking into whether the Obama administration used confidential taxpayer information in an effort to attack a political opponent, Koch Industries. The review was revealed Tuesday by Sen. Charles E. Grassley of Iowa, two weeks after he and a handful of other top Senate Republicans called for the Treasury Departments inspector general for tax issues to look into the matter, saying either administration officials had illegal access to taxpayer information or were inappropriately speculating in public about the companys tax status. Charles and David Koch, brothers who control the Kansas-based company, are libertarians who have used some of their wealth to fund conservative groups and causes that oppose much of President Obamas agenda. Mr. Obama has singled out the company for criticism in speeches. In an Aug. 27 briefing with some reporters on calls to restructure the corporate tax code, an unidentified administration official cited Koch Industries, a major privately held energy company, by name, and then seemed to indicate that the company didnt pay any corporate income tax, according to the Wall Street Journal. In this country, we have partnerships, we have [S corporations], we have [limited-liability companies], we have a series of entities that do not pay corporate income tax, said the senior administration official, according to press reports. Some of which are really giant firms you know, Koch Industries is a multibillion-dollar business. A White House official said Tuesday that the administration will not use the Koch example in the future, but that the comment was not based on any review of tax filings. Other White House officials have told reporters that the information was publicly available, including in testimony to the Presidents Economic Recovery Advisory Board and on Kochs website. But an attorney for Koch said in a statement last month that the company does pay corporate income taxes and that information about its structure and tax liability are not publicly available. Mr. Grassley and his fellow Republicans pointed to that statement in their request for an investigation. The statement that Koch is a [nontaxable] pass-through entity implies direct knowledge of Kochs legal and tax status, which would appear to be a violation of Section 6103″ of the Internal Revenue Code, the senators wrote. Alternatively, if the statement was based on speculation, it raises the question of whether the administration speculating about any specific taxpayers liability is appropriate.