The Department of Homeland Security and the Cybersecurity and Infrastructure Security Agency knew that mass mail-in voting during the 2020 election contained risks but continued to flag social media posts raising such concerns as disinformation, according to new documents obtained by America First Legal in its lawsuit against the agency.

The CISA documents appear to show that in September 2020, officials knew that mail-in voting came with election security risks and that there was no evidence to support the claim that in-person voting would “increase the spread of COVID-19.” Officials also were reportedly aware that mass mail-in efforts presented challenges for election officials.