People of both parties are sick of illegals. Simple as that.
And then there are the millions of Americans who have been the victims of illegal alien crime. Trump was the first one to put a face on the American victims of criminal aliens. Heretofore, all we got from the MSM and the politicians were sob stories about the undocumented living in the shadows separated from their families.
Trump is sticking up for the American people, something none of the others have done when it comes to immigration.