The IRS confirmed in a letter it is looking into claims of “pay-to-play” practices at the Clinton Foundation, after dozens of Republican lawmakers requested a review of potential “criminal conduct” at the organization founded by the family at the center of this week’s Democratic National Convention. Commissioner John Koskinen wrote in a July 22 letter to Republican Rep. Marsha Blackburn that the issue has been “forwarded” to the IRS “Exempt Organizations Examinations” program in Dallas. “This program considers all referrals and will send you a separate acknowledgement letter when it receives your information,” he wrote, in a letter first reported...