Sen. Ted CruzRafael (Ted) Edward CruzOvernight Finance: GOP criticism of tax bill grows, but few no votes | Highlights from day two of markup | House votes to overturn joint-employer rule | Senate panel approves North Korean banking sanctions GOP criticism of tax bill grows, but few ready to vote against it Anti-gay marriage county clerk Kim Davis to seek reelection in Kentucky MORE (R-Texas) called for the appointment of a new special prosecutor to investigate the Internal Revenue Service’s (IRS) targeting of conservative groups.

Cruz wrote a letter to U.S. Attorney General Eric Holder Wednesday, saying the administration has failed to keep its promise of investigating and holding people accountable for the targeting.

“Two hundred fifty-three days have passed since both you and President Obama professed outrage at the IRS’s wrongful conduct,” Cruz wrote. “To date, no one has been indicted.”

Cruz said instead the administration appointed a “partisan, Democrat donor” to lead the Department of Justice’s probe into the IRS, which has yielded no criminal convictions.

“This is a sad state of affairs,” the letter stated. “The widespread perception of partisan bias, of manifest conflict of interest, besmirches the reputation of the Department of Justice. And it undermines confidence in rule of law.”

Cruz said Holder could prove his independence and good intentions by immediately appointing a special prosecutor “with meaningful independence” to investigate the IRS’s targeting of conservative groups.

Last year, reports showed that the IRS denied Tea Party affiliated groups nonprofit tax status — something Republicans jumped on, saying the decisions were politically motivated. President Obama denounced the IRS’s actions, but Cruz said the administration hasn’t gone far enough.