Coburn joined Congressmen Sue Myrick (R-NC), Trent Franks (R-AZ), John Shadegg (R-AZ), Paul Broun (R-GA) and Patrick McHenry (R-NC) in a letter to IRS Commissioner Douglas H. Shulman on November 16, 2009, asking that the Council on American-Islamic Relations (CAIR) be investigated for excessive lobbying and failing to register as a lobbying organization. The request came in the wake of the publication of a book, "Muslim Mafia", the foreword of which had been penned by Myrick, that portrayed CAIR as a subversive organization allied with international terrorists.