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 on Tuesday signed a sweeping executive order attempting a major overhaul of American elections, requiring individuals to prove their citizenship when registering to vote.

Election experts said Trump was claiming power he does not have and said lawsuits over the measure were all but guaranteed.