Immigration has been one of the most contentious and defining issues of the 2024 presidential election, rivaled only by economic policy and national security. The Republican candidate, former President Donald Trump, has largely succeeded in setting the terms of the debate – hammering away at his Democratic rival, Vice President Kamala Harris, with hyperbolic claims that she supports “open borders” and false accusations that the US is experiencing a wave of violent crime committed by migrants. Trump’s immigration rhetoric relies increasingly on lies, misinformation, and racist stereotypes. But his claim that immigration is “out of control” – and his insistence that firm measures are needed to address it – have become central to the Republican platform, and one of Trump’s most frequently repeated campaign promises is that he will deport millions of undocumented immigrants soon after taking office. Why is immigration such a controversial issue in the US? How have the different administrations dealt with it? Is it an overused issue in this campaign?