WASHINGTON, DC - JUNE 02: I.R.S. Commissioner John Koskinen (R) shakes hands with ranking member Sen. Ron Wyden (L) (D-OR) as committee chairman Sen. Orrin Hatch (C) (R-UT) looks on prior to testimony before the Senate Finance Committee June 2, 2015 in Washington, DC. The committee heard testimony on the topic of "Internal Revenue Service Data Theft Affecting Taxpayer Information." (Photo by Win McNamee/Getty Images)