President Donald Trump on Monday vowed more changes to the way elections are conducted in the U.S., but based on the Constitution there is little to nothing he can do on his own.

Relying on false information and conspiracy theories that he’s regularly used to explain away his 2020 election loss, Trump pledged on his social media site that he would do away with both mail voting — which remains popular and is used by about one-third of all voters — and voting machines — some form of which are used in almost all of the country’s thousands of election jurisdictions. These are the same systems that enabled Trump to win the 2024 election and Republicans to gain control of Congress.

Trump’s post marks an escalation even in his normally overheated election rhetoric. He issued a wide-ranging executive order earlier this year that, among other changes, would have required documented proof-of-citizenship before registering to vote. His Monday post promised another election executive order to “help bring HONESTY to the 2026 Midterm elections.”

The same post also pushed falsehoods about voting. He claimed the U.S. is the only country to use mail voting, when it’s actually used by dozens, including Germany, Switzerland and the United Kingdom.

Similar complaints to Trump’s, when aired on conservative networks such as Newsmax and Fox News, have led to multimillion dollar defamation settlements, including one announced Monday, because they are full of false information and the outlets have not been able to present any evidence to support them.

Trump’s post came after the president told Fox News that Russian President Vladimir Putin, in their Friday meeting in Alaska, echoed his grievances about mail voting and the 2020 election. Trump continued his attack on mail voting and voting machines in the Oval Office on Monday, during a meeting with Ukrainian President Volodymyr Zelenskyy.

The announcement signals yet another way that Trump intends to stack the cards in his favor in the 2026 midterm elections, after he already has directed his attorney general to investigate a Democratic fundraising platform and urged states to redraw their congressional districts to help the GOP maintain its majority in the House of Representatives.

Here’s a breakdown of Trump’s latest election post and why Congress is the one entity that can implement national election rules.

Trump for years has promoted false information about voting, and Monday was no exception.

He claimed there is “MASSIVE FRAUD” due to mail voting, when in fact voting fraud in the U.S. is rare. As an example, an Associated Press review after the 2020 election found fewer than 475 cases of potential fraud in the six battleground states where he disputed his loss, far too few to tip that election to Trump.

Washington and Oregon, which conduct elections entirely by mail, have sued to challenge Trump’s earlier executive order — which sought to require that all ballots must be received by Election Day and not just postmarked by then. The states argue that the president has no such authority, and they are seeking a declaration from a federal judge in Seattle that their postmark deadlines do not conflict with federal law setting the date of U.S. elections.