SPRINGFIELD — Attorney General Kwame Y. Raoul announced Tuesday that he has joined a group of 19 attorneys general in supporting a lawsuit that challenges the United States Customs and Border Protection’s practice of denying people access to asylum process at ports of entry on the southern border.Raoul joined the multistate amicus brief brought by a Los Angeles-based nonprofit legal services provider Al Otro Lado. The brief urges the U.S. District Court for the Southern District of California to deny the …