Donald Trump’s position on immigration is a major explanation for his victory. His nearly unwavering support for harsh immigration enforcement and a border wall fed off of the perception of an immigration system as chaotic and uncontrolled. He depicted a porous border and a large illegal immigrant population in a way that made many Americans feel like they weren’t in control of their country anymore.
Trump’s promise to regain control resonated.



A recent paper by political scientists Allison Harell, Stuart Soroka, Shanto Iyengar explains how lack of control over immigration diminishes support for immigration.
Based on survey data from Canada, the UK, and the U.S., people were more opposed to immigration if they felt like their government was less in control; hence support for a candidate wants to bring it under control.
Only 37 percent of American respondents reported that the government was in control of immigration. According to the control theory, the routine failures at immigration reform in the United States, the rise and election of Trump, and in Britain’s case Brexit come from voters feeling that they don’t control the borders.