3. Terrorists aren’t undocumented.

Trump has proclaimed that building a wall on the Southern border will thwart terrorists. Yet there is no evidence that any terrorists have ever entered the U.S. through the Mexican land boundary, and the Department of Homeland Security has long held that it has “no credible intelligence to suggest terrorist organizations are actively plotting to cross the southwest border.”

In fact, most terrorists active in the United States are homegrown. Since 9/11, over 80 percent of individuals who were charged with or died while engaging in jihad-related terrorist activities in this country have been U.S. citizens or permanent residents.

As for those terrorists who are foreign born, according to a list complied by Alex Nowrasteh, of 154 foreign-born people who committed or plotted terrorist attacks on U.S. soil from 1975 through 2015, only 1 was Mexican.