Navient Corp., a major U.S. Department of Education student loan contractor, is “misleading” borrowers and “doing some really terrible things,” Democratic presidential candidate Hillary Clinton said Saturday. Numerous government agencies have been investigating the nation's largest student loan specialist over several years for allegedly overcharging borrowers and mistreating them in violation of the law. The Consumer Financial Protection Bureau in August told Navient, which collects borrowers' monthly payments and counsels them on their repayment options, that it had amassed enough evidence to indicate the company violated consumer protection laws, and it might sue the company in court.