The Constitution “does not grant the President any specific powers over elections,” she wrote.

Among other proposed changes, Trump’s order would have required people to provide documentary proof of citizenship when registering to vote, prevented mail ballots from being counted if they arrive after Election Day, even if they were postmarked by then, and punished states that failed to comply by withholding certain federal money.

It was the latest in a string of rulings against the elections executive order Trump signed just months after taking office for his second term. He has since signed another executive order on elections, seeking to create a national voter list and limit mail balloting. That directive also faces multiple legal challenges.

Last fall, a federal judge in Washington, D.C., overseeing a separate challenge to the first election executive order by civil rights and Democratic Party-aligned groups blocked the government from taking steps to include the proof-of-citizenship requirement on the federal voter registration form. That judge later barred the Secretary of Defense from requiring documentary proof of citizenship when military personnel register to vote or request ballots.

In an apparent nod to the difficulty of implementing a proof-of-citizen requirement by executive order, Trump is pushing legislation in the Republican-controlled Congress to create such a mandate. The SAVE America Act has passed the House but has stalled in the Senate, leading Trump to advocate for eliminating the filibuster that is blocking the legislation.

On Wednesday, he abruptly cancelled the expected signing of a bipartisan housing bill, saying he won’t sign legislation until Congress passes his proof of citizenship requirement for voting.