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Trump's claims about the southern border also fail to emphasize that the majority of illegal immigration occurs when immigrants overstay their temporary visas. During fiscal 2017, the Department of Homeland Security (DHS) found that 701,900 immigrants with visas remained in the U.S. past their expected departure date, more than double the 303,916 immigrants apprehended at the border during that same time frame. A report by the Center for Migration Studies found this pattern to be true for every year since 2007.

One population at the border that has grown in recent years is asylum-seekers. In fiscal 2018, 92,959 people at the southern border requested asylum, up 67 percent from the previous year. Asylum-seekers made up 18 percent of all apprehensions at the border, "a dramatic departure from 2000-2013, when fewer than 1 percent of those encountered by CBP initiated asylum claims," according to a CBP report.

The Trump administration has intentionally limited the number of asylum cases processed at the border each day, a practice known as "metering," in an attempt to dissuade immigrants from coming to the country. However, DHS has acknowledged that the practice "may have led to additional illegal border crossings."

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Most illegal immigration isn't at Mexican border where ...