Immigration opponents have come up with some absurd scenarios about how many additional people can be admitted to the United States via connections with one immigrant under “chain migration,” and the Trump administration argues the policy is a national security risk. Both claims fail to take into account the actual facts. The number of visas available through family migration is far lower than the demand, so the United States maintains a huge backlog of people trying to come here that way. Depending on what country you come from, you may have to wait anywhere from one to two decades for your application to be processed. And even then, there’s no guarantee you’ll get in. The United States screens prospective immigrants on these kinds of visas for criminal records, terrorist ties and their ability to support themselves in the U.S.