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.

According to the secretary of state, about 80% of ballots in California were cast by mail last year in the general election.

After spending years making false claims about election fraud and rampant non-citizen voting, Trump issued an executive order Tuesday imposing "proof of citizenship" requirements for voters.