WASHINGTON (AP) — President Donald Trump on Tuesday signed an executive order to create a nationwide list of verified eligible voters and to restrict mail-in voting, a move that swiftly drew legal threats from state Democratic officials ahead of this year’s midterm elections.

The order, which voting law experts say violates the Constitution by attempting to seize states’ power to run elections, is the latest in a torrent of efforts from Trump to interfere with the way Americans vote based on his false allegations of fraud. The president has repeatedly lied about the outcome of the 2020 presidential campaign and the integrity of state-run elections, asserting again Tuesday that he won “three times” and citing accusations of voter fraud that numerous audits, investigations and courts have debunked.

The order signed Tuesday calls on the Department of Homeland Security, working in conjunction with the Social Security Administration, to make the list of eligible voters in each state. It also seeks to bar the U.S. Postal Service from sending absentee ballots to those not on each state’s approved list.

Trump is also calling for ballots to have secure envelopes with unique barcodes for tracking, according to the executive order, which was first reported by the Daily Caller. Federal funding could be withheld from states and localities that don’t comply.

“The cheating on mail-in voting is legendary. It’s horrible what’s going on,” Trump said, repeating his false allegations about mail ballots as he signed the order. “I think this will help a lot with elections.”

Within minutes of Trump signing the order, top elections officials in Oregon and Arizona, two states that rely heavily on mail ballots, pledged to sue, arguing that the president was illegally encroaching on the right of states to run elections.

Arizona Secretary of State Adrian Fontes said the state’s vote-by-mail system was designed by Republicans and is now used by 80% of voters.