Photo by: Manuel Balce Ceneta
FILE - In this Feb. 10, 2016 file photo, Internal Revenue Service (IRS) Commissioner John Koskinen testifies on Capitol Hill in Washington. House conservatives on July 13, 2016, have taken the first step to force an impeachment vote on Koskinen. Conservatives accuse Koskinen of gross negligence, arguing he stonewalled their investigation into IRS targeting of conservative groups. (AP Photo/Manuel Balce Ceneta, File)