WASHINGTON, DC - MAY 19: The Internal Revenue Service, on May, 19, 2013 in Washington, DC. (Photo by Bill O'Leary/The Washington Post) (Bill O'Leary/The Washington Post)

True the Vote, a Houston-based voter watchdog group that arose from a tea party organization, filed suit in federal court Tuesday against the Internal Revenue Service over the agency's processing of its request for tax-exempt status.

The lawsuit, filed by the conservative ActRight Legal Foundation, asked the U.S. District Court for the District of Columbia to grant its request for tax-exempt status and award damages for what it described as unlawful conduct by the IRS. True the Vote, which was founded in June 2010, is affiliated with the King Street Patriots, a tea party group which started in December 2009.