Donald Trump's effort to seize control of the 2026 midterms is looking more and more like his failed efforts to overturn the 2020 election results. After months of rhetoric and lies, he is getting humiliated in court.

In 2020, I led a legal team that handed him and his allies more than 60 court defeats and protected the outcome of the presidential election. Since retaking office, Trump's Department of Justice has lost 21 straight cases seeking to obtain state voter records. His first executive order on voting was blocked. The DOJ has lost a myriad of other cases aimed at making voting this fall more difficult.

Now, a Massachusetts federal court has delivered a new blow to Trump's latest scheme to rig the midterms, and it is a huge win for the pro-democracy movement.

Last night, Judge Indira Talwani granted a group of nonprofit organizations an injunction blocking Trump's attack on mail-in voting — specifically, having the United States Postal Service refuse to deliver absentee ballots to voters not on a state-approved list. As a result of Judge Talwani’s order, USPS will continue to be required to deliver mail-in ballots to every voter who requests one.

What makes this victory particularly important is that it has nationwide effect. A previous court ruling had already blocked this same provision, and several others, from being implemented — but only in the 24 states with Democratic attorneys general.

Those attorneys general had sued and won, but they could not obtain nationwide relief. Last night's ruling closes that gap: it binds USPS everywhere, not just in the states that sued.

This fight is not over. The DOJ has sought emergency relief to overturn the attorneys general’s victory in the U.S. Supreme Court. And several other cases on the same topic remain pending around the country.

What is most striking about all these cases — including the one decided last night — is the broad agreement that what Trump is doing is both destructive to elections and plainly unconstitutional. Court after court has made this point...