By Daniel Strauss - 05/23/13 03:30 PM EDT
Coburn made the charge during an interview on MSNBC.
"And so there are a lot of questions that still have to be answered," Coburn said. "Maybe that's untrue but that's certainly the implication from people that are calling me from Oklahoma."
Coburn's comments come as Congress is investigating the IRS's targeting of conservative groups seeking tax-exempt status for additional scrutiny. The IRS has apologized for inappropriately flagging groups for additional scrutiny because they had certain words in their titles, such as Tea Party.
Read more on The Hill's Blog Briefing Room.