RICHLAND — Attorney General Bob Ferguson today co-led a coalition of 13 states in filing a lawsuit against the U.S. Department of Homeland Security over changes to the “public charge” rule that target immigrants and their families. The 169-page complaint, filed in U.S. District Court for the Eastern District of Washington, asserts that the Trump Administration’s new rule unlawfully expands the definition of “public charge,” in violation of federal immigration statutes, the Welfare Reform Act and the Administrative Procedure Act.