Mr. Biden will go to Brownsville, Texas, a city in the Rio Grande Valley that has historically seen large influxes of migrants. Mr. Trump will be more than 300 miles away in Eagle Pass, Texas, a border city that has become a common backdrop for politicians who want to show they are tough on immigration.
As the politics of immigration in America shift sharply to the right, polls have revealed growing support even inside the president's own party for border measures once denounced by Democrats and championed by Mr. Trump.
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