At issue in this case is whether states may use total population—as opposed to number of registered voters or number of citizens of voting age—to draw district lines. Following the decennial census in 2010 the Texas Legislature adopted a redistricting plan that created roughly proportionally-sized state senate districts with regard to total population, including registered voters, eligible voters, and people who are ineligible to vote. While the districts had roughly the same total population, the district sizes varied with regard to other metrics. Plaintiffs filed suit alleging that the redistricting plan violated the one person, one vote principle of the Equal Protection Clause. ADL joined an amicus brief arguing that barring states from using total population to draw district lines could unfairly exclude current and potential voters from the democratic process and would lead to underrepresentation of groups disenfranchised by discriminatory voting laws.