Washington - Republicans stepped up their attacks on Monday on former Secretary of State Hillary Clinton’s use of a private email server and pointed to newly released messages to allege that foreign donors to the Democratic presidential nominee’s family charity got preferential treatment from her department.

Congressional Republicans issued subpoenas to three technology companies that either made or serviced the server located in the basement of Clinton’s New York home. The subpoenas were issued Monday by House Science, Space and Technology Chairman Lamar Smith of Texas with the support of Senate Homeland Security Chairman Ron Johnson of Wisconsin.

In a joint statement, Smith and Johnson said the move was necessary after the three companies — Platte River Networks, Datto Inc. and SECNAP Network Security Corp. — declined to voluntarily answer questions to determine whether Clinton’s private server met government standards for record-keeping and security.

The subpoenas were among several developments Monday that showed a new GOP emphasis on Clinton’s emails after the FBI recently closed its yearlong probe into whether she and her aides mishandled sensitive government information that flowed through her server, without recommending criminal charges.... Read More: VIN