Recent research from the Congressional Budget Office suggests that an initial undercounting of undocumented migrants may help explain the surprisingly resilient US economy during the last two years. From a macroeconomic perspective, the future path of migration flows will significantly affect longer-term estimates of potential economic growth and public budget trajectories. In this episode, we talk with Julia Gelatt, Associate Director of the US Immigration Policy Program at the Migration Policy Institute, about the current state of US immigration, the most important drivers of US migration flows, the role of policy versus external factors, and the impacts of migration on the US economy and federal budget.