The Justice Department has declined to pursue contempt of Congress charges against Lois Lerner for refusing to testify about her role at the IRS in the targeting of conservative groups.

The department announced the decision in a letter Tuesday to House Speaker John Boehner, whose Republican-controlled chamber made the request to prosecute, after holding Lerner in contempt for refusing to testify at committee hearings.

"Once again, the Obama administration has tried to sweep IRS targeting of taxpayers for their political beliefs under the rug, Boehner spokesman Michael Steel told FoxNews.com.

Lerner asserted her Fifth Amendment privilege, which allows people to not testify against themselves, during a May 2013 hearing of the House Committee on Oversight and Government Reform and then again at a March 2014 hearing.

However, House Republicans argued Lerner waived the privilege with an opening statement she made before the committee in the May 2013 appearance. All the chambers Republican members and six Democrats officially voted in May 2014 to hold Lerner in contempt.

Ron Machen Jr., the U.S. attorney for the District of Columbia, said in the seven-page letter that federal prosecutors concluded Lerner did not waive her privilege because she made only general claims of innocence during the opening statement.

Thus, the Fifth Amendment to the Constitution would provide Ms. Lerner with an absolute defense should be prosecuted for her refusal to testify, wrote Machen, who was appointed to the U.S. attorney post by President Obama and left for private practice Wednesday, one day after sending the letter.

He also said he will not refer the case to a grand jury or take any other action to prosecute.

Lerner ran the IRSs exempt organizations unit when Tea Party and other nonprofit groups with conservative names applying for tax-exempt status were targeted for additional auditing from April 2010 to April 2012.

She was placed on administrative leave in May 2013 and retired four months later.

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Feds won't pursue contempt charges against Lerner for not testifying before House - VIDEO: DOJ: No contempt charges ...