True the Vote – one of the conservative groups the IRS singled out for special scrutiny when it applied for tax-exempt status – updated its federal lawsuit this week against the IRS, adding the agency Chief Counsel William Wilkins, a presidential appointee, and five other ranking officials as defendants.

The Texas-based group founded to combat elections fraud argues that the IRS targeted it for scrutiny because it is aligned with other conservative groups and trains volunteers to monitor elections and take issue with suspicious voter registrations.