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Key members of the House Committee on Oversight and Government Reform expressed outrage at revelations made in newly released emails showing ex-IRS official Lois Lerner coordinating with the Department of Justice on prosecuting nonprofit groups.

One committee member said the emails prove why the IRS is “scared to give up the rest of Lois Lerner’s emails.” IRS commissioner John Koskinen was recently threatened with contempt for stonewalling the committee’s investigation. Koskinen claimed in a hearing that it could take years to provide the documents requested by Oversight.

“The release of new documents underscores the political nature of IRS Tea Party targeting and the extent to which supposed apolitical officials took direction from elected Democrats,” Oversight chairman Rep. Darrell Issa said in a statement. “These e-mails are part of an overwhelming body of evidence that political pressure from prominent Democrats led to the targeting of Americans for their political beliefs.”