President Donald Trump signed an executive order Tuesday seeking to boost proof of citizenship requirements for voter registration, which critics say could disenfranchise poor and older voters who don’t have easy access to citizenship documents like passports or birth certificates.

President Donald Trump signed an executive order Tuesday outlining sweeping changes to the way federal elections are carried out nationwide, a responsibility the Constitution explicitly assigns to the states and Congress.

The order, which is likely to face swift challenges, includes requiring documentary proof of citizenship to register to vote.