On April 25, President Trump renewed his call to end the Senate filibuster in connection with the SAVE America Act, warning in a post on Truth Social that failure to move the legislation through the upper chamber would be a disastrous political mistake for Republicans. He is right about the stakes.The SAVE America Act is the most important election reform bill in a generation. For those concerned about election integrity, the bill addresses a serious weakness in America’s voting system: In numerous states, noncitizens can illegally register to vote with alarming ease, while state officials often lack the tools needed to determine how widespread the problem is.The current rules make it easy for noncitizens and citizens alike to illegally register to vote.Federal law already prohibits noncitizens from voting in federal elections. The trouble is that the law contains far too few meaningful safeguards to make sure that rule is actually followed.Across more than 40 states, voter registration standards are so weak that election officials often have no reliable way to determine whether a person seeking to register is, in fact, an American citizen.Oregon is a useful example. On the state’s voter registration form, applicants are given three broad options for proving identity. They may provide a state-issued ID such as a driver’s license, the last four digits of a Social Security number, or one item from a lengthy list of other accepted documents.That system is deeply flawed. In 19 states, Oregon among them, illegal immigrants may obtain a driver’s license or another form of driving authorization. As a result, possession of a driver’s license does not establish citizenship. At most, it might help officials later identify a questionable registration if the state conducts a serious review of its voter rolls.But an applicant does not even have to rely on a state ID. A person can choose instead to submit the last four digits of a Social Security number.At first glance, that might appear to be a strong barrier, since illegal immigrants are not lawfully issued Social Security numbers. But that assumption ignores a serious and long-running problem: Many illegal immigrants have obtained and used Social Security numbers, and millions more Social Security numbers have been stolen and made available on the dark web.RELATED: How Republicans have failed to defund sanctuary cities for a generation J. David Ake/Getty ImagesEarlier this year, researchers released a report uncovering a large illegal online database that included “2.7 billion records with Social Security numbers.” It’s hard to tell how many of the records involved the same Social Security number or a false number, but the total number of records is so high that it’s possible that this one report shows that the vast majority of Americans have already had their Social Security number illegally taken. The weaknesses in the system go even further than SSNs. People can also register without submitting either a state ID or a Social Security number. They can instead rely on various substitute documents, none of which establish that the applicant is a U.S. citizen.Oregon again shows how reckless these rules can be. Its voter registration form permits applicants to use non-government photo identification. It also allows documents such as a paycheck stub, utility bill, or bank statement. Under these rules, a person with a mailing address and a cable or gas bill could be placed on the voter rolls without ever having to provide a reliable form of identification. Pretending these rules ensure elections are secure is nothing short of delusional. The current rules make it easy for noncitizens and citizens alike to illegally register to vote. For example, in many states, there are few safeguards to stop a parent from stealing the identity of his or her adult child to cast a second ballot. All the parent would need to register in the name of a child is the last four digits of his or her Social Security number, information that nearly all parents have.Although voter registration rules are dangerously weak in much of the country, the protections that exist at the ballot box differ widely from state to state. In places with strong voter ID requirements and widespread in-person voting, it is much harder for noncitizens and citizen identity thieves to cast ballots. But many states have failed to adopt those basic safeguards.RELATED: Red states are not waiting for Congress to pass the SAVE America Act Paul Hennessy/SOPA Images/LightRocket/Getty ImagesTwenty-four states require voters to present photo identification when voting in person, while 12 additional states require some form of identification but do not require that the ID include a photo.Fourteen states impose no voter ID requirement for most voters.