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.

Trump has signed an executive order requiring documentary proof of citizenship to register to vote in federal elections and mandating that all ballots be received by Election Day.

Mexican Foreign Minister Juan Ramon de la Fuente spoke with the U.S. Deputy Secretary of State Christopher Landau on Wednesday in a call focused on strengthening bilateral relations, Mexico's foreign ministry said.