By Josh Hicks, Jan. 9, 2014

Two Republican lawmakers and a conservative legal group are questioning the Justice Department’s selection of a Democratic donor to lead the agency’s probe into the Internal Revenue Service’s targeting of certain advocacy groups during the 2010 and 2012 election cycles.

House Oversight Committee Chairman Darrell Issa (R-Calif.) and Rep. Jim Jordan (R-Ohio) issued a letter to U.S. Attorney General Eric H. Holder Jr. on Wednesday demanding the department remove DOJ trial attorney Barbara Bosserman from the case, saying her involvement is “highly inappropriate and has compromised the administration’s investigation of the IRS.”

Bosserman donated a combined $6,750 to President Obama’s election campaigns and the Democratic National Committee between 2004 and 2012, according to federal campaign finance records.

The American Center for Law and Justice, which represents 41 groups suing the IRS over its controversial screening methods, also criticized the appointment of Bosserman to lead the probe.

“Appointing an avowed political supporter of President Obama to head up the Justice Department probe is not only disturbing but puts politics right in the middle of what is supposed to be an independent investigation to determine who is responsible for the Obama administration’s unlawful targeting of conservative and tea party groups,” ACLJ chief counsel Jay Sekulow said in a statement Thursday.

The Justice Department said that it cannot take political leanings into account when assigning cases and that making legal political contributions does not prevent its attorneys from fulfilling their duties without bias.