They might not have told him about the investigation but he already KNEW that the IRS was handling the applications this way because he started it. It doesn't matter when he knew about the investigation, it matters when he knew that the IRS was helping him campaign. Yes. Remember last week Obama was asked if he knew about the targeting?
His response... "I only found out about the REPORT a few days ago."
He completely sidestepped the question about the targeting. Blatant evasion.