(二)The U.S. Justice Department has dispatched an experienced federal hate crimes lawyer to Iowa to help prosecute a man charged with murdering a transgender high school student last year, a highly unusual move that officials said was personally initiated by Attorney General Jeff Sessions. In taking the step, Sessions, a staunch conservative, is sending a signal that he has made a priority of fighting violence against transgender people individually, even as he has rolled back legal protections for them collectively. The Justice Department rarely assigns its lawyers to serve as local prosecutors, and only in cases in which they can provide expertise in areas that the federal government views as significant. By doing so in this instance, Sessions put the weight of the government behind a small-city murder case with overtones of gender identity and sexuality.（20 分）