Immigrants are increasingly unwelcome. Over half of Americans favour “deporting all immigrants living in the US illegally back to their home country”, up from a third in 2016. Just 10% of Australians favour more immigration, a sharp fall from a few years ago. Sir Keir Starmer, Britain’s new centre-left prime minister, wants Britain to be “less reliant on migration by training more UK workers”. Anthony Albanese, Australia’s slightly longer-serving centre-left prime minister, recently said his country’s migration system “wasn’t working properly” and wants to cut net migration in half. And that is before you get to Donald Trump, who pledges mass deportations if he wins America’s presidential election—an example populist parties across Europe hope to follow.