Donald Trump has been stepping up his anti-immigrant rhetoric, often relying on falsehoods about migration. But the Republican presidential contender's speeches and online posts on the matter are resonating with many of his core supporters going back a decade, to when “build the wall” chants rang out at his campaign rallies. His message also appears to be landing with key elements of the Democratic coalition that President Joe Biden will need to win over in November. That's a worrying sign for Biden, who portrays the situation at the U.S.-Mexico border as a policy dispute that Congress can fix.
