Ask the expert: Why is immigration reform so contentious?

The issue of immigration reform is one that both Republicans and Democrats have sought to address for years with little success. And many voters are losing their patience with the lack of progress — whether resulting from ineffective bills passed, bills that have failed to pass, or executive orders from presidents. Veronica Tobar Thronson is a clinical professor of law who directs the Immigration Law Clinic at the Michigan State University College of Law. Here, she provides an overview of why there has been a lack of immigration reform and how it has become a leading political issue.