Officials believe Russia is trying to spread disinformation and hack into U.S. political systems. The Washington Post reports that officials do not have “definitive” proof of a Russian operation. The report comes after the Democratic National Committee reported a data breach in June. The FBI is investigating the breach, and officials have pointed to Russia as the source of the attack. Russia has denied involvement in the attack, and the FBI has said it is investigating it as part of a global hacking campaign.”]