President Donald Trump’s executive order seeking broad changes to how elections are run in the U.S. is vast in scope and holds the potential to reorder the voting landscape across the country, even as it faces almost certain litigation.

Election experts said Trump was claiming power he does not have, all but guaranteeing lawsuits over the measure.

After the president signed his executive order Tuesday calling for broad election changes, such as proof of citizenship for voter registration and an Election Day return deadline for mailed ballots, election officials,