In a presidency marked by political controversies, immigration — particularly the iconic border wall — stands out as probably the biggest source of acrimony. The Trump administration has taken a consistently firm line on immigration, and this has put it at loggerheads with most of the Democratic Party and even some Republicans and Libertarians.
The US has a complex relationship with immigration. More than most, this is a nation of immigrants, so there’s a long history of welcoming newcomers. However, over the last century, there’s been growing tension between legal and illegal immigration. Few are opposed to people coming here to live legally, but there’s now a sharp left/right divide on the subject of those who break the law to come.