^^^
In August 2018, Florida Senator Bill Nelson, who was running for reelection against then governor Rick Scott, sounded the alarm that Russia had actually breached voter registration systems in Florida and that the hackers had persistent access to those systems. This information had been withheld from the public by the DHS (led by Republican Kirstjen Nielsen), FBI (led by Republican Christopher Wray), bipartisan Senate Committee memo, and even Mueller’s July 2018 indictment.
Addendum
Here’s a link to the NSA report leaked by Winner: https://theintercept.com/2017/06/05/top-secret-nsa-report-details-russian-hacking-effort-days-before-2016-election/
March 2019 report prepared by SC Robert Mueller was hired by Congress to investigate possibility that the Trump campaign had “colluded” with Russia in its attack (the “Mueller report”).
The July 2019 report by the bipartisan Senate Intelligence Committee on Russian interference in the 2016 election (the bipartisan Senate report).
Mueller’s July 2018 indictment against Russian hackers, beginning with Paragraph 71.