https://arstechnica.com/information-technology/2019/04/dhs-fbi-say-election-systems-in-50-states-were-targeted-in-2016/

A joint intelligence bulletin (JIB) has been issued by the Department of Homeland Security and Federal Bureau of Investigation to state and local authorities regarding Russian hacking activities during the 2016 presidential election. While the bulletin contains no new technical information, it is the first official report to confirm that the Russian reconnaissance and hacking efforts in advance of the election went well beyond the 21 states confirmed in previous reports.