U.S. officials say Russia smeared Tim Walz, might stoke post-vote violence The Washington PostUS intel assesses Russian operatives behind fake video trying to smear Tim Walz CNNFalse claims about Tim Walz went viral on social. A U.S. intelligence official says Russia is to blame AxiosRussian disinformation groups promoting false claims about Gov. Tim Walz, experts say CBS NewsU.S. intel officials say Russia is behind attempts to smear Tim Walz NPR