The attempt to block IRS performance awards mirrors earlier move against VA executives.
The lawsuit will challenge IRS rules related to social welfare groups.
E-mails have raised concerns that the IRS may have shared confidential taxpayer information with the FEC.
The new information comes from a congressional interview with an IRS attorney.
Congressional investigators have spent the past several months interviewing employees from the IRS offices in both regions.
Lerner, an IRS officials who oversaw the agency's tax-exemption operations, refused to testify before Congress and is on leave.
The Republican congressman said Wednesday that talks with IRS employees showed the effort "didn't originate in Cincinnati."
The agency announced the move in an internal memo on Monday.