Congressional Democrats moved Sunday to formalize oversight pressure on the Cybersecurity and Infrastructure Security Agency (CISA) and the White House, calling for an independent investigation after reporting revealed that Trump administration election-security officials last year pursued an effort to ban roughly half of all voting machines used in U.S. elections, citing conspiracy theories that federal cybersecurity experts had repeatedly debunked.

Senate Minority Whip Dick Durbin and House Democratic Caucus Chair Pete Aguilar issued a joint letter to CISA Director Sean Plankey and the Government Accountability Office demanding a full accounting of internal communications between Trump's election-security czar and state election administrators. The letter, circulated Sunday morning, asked whether any federal funds were used in the campaign and whether career officials were pressured or sidelined when they objected to the effort.

The push comes one day after reporting detailed how Trump's point man on election security worked to have certification stripped from voting machines manufactured by Election Systems & Software and Dominion Voting Systems, companies that have already won defamation settlements over similar false claims. Congressional Democrats argued the episode represented not only an abuse of executive authority but a direct threat to the infrastructure of the 2026 midterm elections, now less than six months away.

Republican committee chairs on the House Administration Committee dismissed the Democratic request as political theater, with Chairman Bryan Steil of Wisconsin issuing a statement saying the effort was 'a desperate attempt to relitigate 2020 conspiracy claims in reverse.' State election directors in Pennsylvania, Georgia, and Michigan — all of whom use the targeted machines — said Sunday they had not received any formal decertification notices and were monitoring the situation closely.

Election law advocates warned that even a failed attempt to delegitimize certified voting infrastructure could seed doubt among voters ahead of November. 'The damage isn't just legal — it's epistemic,' said Wendy Weiser of the Brennan Center for Justice. 'When federal officials amplify disinformation about voting machines, it doesn't matter that the effort failed. The uncertainty is the point.' CISA had not responded to the congressional letter by Sunday afternoon.