Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellPew poll: 50 percent approve of Democrats in Congress Pelosi on power in DC: 'You have to seize it' Progressives put Democrats on defense MORE (R-Ky.) said he wouldn’t support any nominee to lead the Internal Revenue Service (IRS) until the administration provides answers on an investigation that the agency targeted Tea Party groups.

“[The administration] expect us to just clear the way tomorrow and let them ram through the president’s new pick to run the IRS,” McConnell said Thursday. “I will not be supporting any nominee to lead this agency until the American people get the answers they deserve.”

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Earlier this week, Senate Majority Leader Harry ReidHarry Mason ReidThe Hill's Morning Report - Presented by Tax March - CDC in limbo on J&J vax verdict; Rep. Brady retiring Biden to tap Erika Moritsugu as new Asian American and Pacific Islander liaison White House races clock to beat GOP attacks MORE (D-Nev.) filed cloture on several of President Obama’s executive and judicial nominees, including the nomination of John Koskinen to be commissioner of the IRS.

McConnell said he was reassured after talking with Koskinen that he would cooperate with an investigation into why the IRS targeted Tea Party organizations by rejecting their tax-exempt status, but that it wasn't enough to regain his trust.

“To his credit, Mr. Koskinen has assured me he agrees with me on a topic I feel strongly about — that the IRS should stay out of regulating political speech,” McConnell said. “[But] the IRS has done a lot to lose the trust of the American people. It will need to do a lot more to regain it.”

Reid has told senators to prepare for weekend work in order to clear several of Obama’s nominees since Republicans have refused to yield back any debate time as a protest to Democrats unilaterally changing the filibuster rules last month.