Days after a tight U.S. Supreme Court ruling that states, including Illinois, could keep counting mail-in ballots cast by Election Day that arrive later, Gov. JB Pritzker and other Democratic governors came out against a separate proposed rule change to curb mail-in and absentee voting.

Pritzker joined the governors of California, Connecticut, Minnesota, New York, Pennsylvania, Rhode Island, Washington and Wisconsin to decry major tweaks to the U.S. Postal Service’s standards.

Among President Donald Trump’s proposed changes is the creation of a federally managed voter list. Trump is separately pressing for passage of the SAVE America Act in Congress. The legislation would require proof of citizenship to register to vote, a photo ID to cast a ballot in federal elections and would sharply restrict mail-in voting.

The president, citing allegations of fraud that have been repeatedly debunked, first signed an executive order proposing the federal voter list this spring. The order also barred the Postal Service from sending absentee ballots to people who are not listed on each state’s approved roster, mandated bar codes be printed on mail-in ballots for tracking purposes and withheld federal funding from states that don’t comply.

Trump’s directive has triggered several lawsuits that have partially blocked the president’s order and the Postal Service’s drafted rules to implement it. The rule has not been finalized — Thursday was the deadline for people to submit comments to the Postal Service about it.

Pritzker and the other governors submitted a seven-page opposition Thursday, arguing the changes risked “the disenfranchisement of millions of voters.”

The proposed “absentee voter master list is an unlawful and insecure process of maintaining voter rolls that is subject to the president’s arbitrary and often punitive whims, as well as errors due to outdated or incorrect data,” the group said in a release from Pritzker’s office. The release also defending the necessity of having a separate system from the federal government.

“Our states do not just serve as ‘guard dogs’ for any federal misbehavior. Instead, states remain significantly functionally independent of, and resistant to capture by, the Executive Branch due to a uniquely American mix of tradition, doctrine, and resource constraints,” their comments read. The state system acts as a “bulwark against efforts by an authoritarian president to make the overall electoral playing field unfair.”

They asked the Postal Service to withdraw the proposed rules right away, arguing implementation just before November’s election “would interrupt months of planning, systems testing, materials preparation, poll worker training, and voter registration and education. Requiring the USPS to do so would strain local and state resources, cast the upcoming elections into uncertainty, and effectively diminish trust in our democratic process.”

Pritzker, a rumored presidential candidate in 2028, has been one of Trump’s loudest critics nationally. “President Trump is once again orchestrating an illegal scheme to control the postal service and deny people their right to vote,” he said in the release. “We must uphold the Constitution and protect the existing election authorities at every level of government that have always facilitated free and fair elections.”

The governor similarly criticized Trump when lauding this week’s Supreme Court ruling, describing the attempt to curb counting of mail ballots that arrive after Election Day as “asinine.”

“We cannot look away while the most corrupt president in history attempts to rewrite our election laws to serve his own interests,” he said.