Apple Inc on Friday said it has tightened some of its rules for responding to legal requests after the U.S. Justice Department during Donald Trump's presidency subpoenaed it for information on Democratic lawmakers. Apple said it recently instituted a limit of 25 identifiers such as email addresses or phone numbers per legal request. The Cupertino, California-based company said it received a subpoena from the Justice Department in February 2018 for information on 109 identifiers made up of 73 phone numbers and 36 email addresses, but that it did not release content such as emails and pictures to prosecutors.