A U.S. lawmaker has introduced two bills to protect voting systems from hacking, amid fears that Russian cyber spies may be interfering with this year’s presidential election. Representative Hank Johnson, a Democrat serving Georgia, is proposing a moratorium on state purchases of electronic voting machines that don’t produce a paper trail. His Election Integrity Act, introduced Wednesday, would also prohibit voting systems from being connected to the internet as a way to prevent online tampering. The high-profile hack of the Democratic National Committee publicized in June has citizens worried that U.S. election systems may be vulnerable, Johnson said.