At the beginning of his campaign for president, Donald Trump disparaged Mexican immigrants coming to the US and since then, immigration has been a centerpiece of his administration. But to say that America's immigration debate started with Donald Trump is simply not true. Professor James Hollifield highlights the long history of immigration policy in this country and argues that the conversation won't be going away any time soon, no matter what happens in 2020.

For more on this topic:

• Check out Hollifield's paper, The Migration Challenge
• Read his essay, What Makes Immigration Reform So Hard