Obama admin officials were made aware of IG investigation last June.
WASHINGTON — The Treasury Department’s inspector general told senior Treasury officials in June 2012 he was auditing the Internal Revenue Service’s screening of politically active organizations seeking tax exemptions, disclosing for the first time on Friday that Obama administration officials were aware of the matter during the presidential campaign year.
http://www.nytimes.com/2013/05/18/us/politics/irs-scandal-congressional-hearings.html?hp&_r=3&