Fact-Checking Trump’s Recent Immigration Claims

Former President Donald J. Trump has drawn widespread censure after reprising a line that casts undocumented immigrants as “poisoning the blood of our country.”

The remark underscored Mr. Trump’s hard-line approach to immigration, which has been central to his platform since he made his first bid for president in 2015. If elected again, he has vowed to carry out mass deportations and enact other strict policies.

He and his Republican rivals have pointed to the surge of migrants at the southern border to make their political case. Some Democrats, too, have been critical of the Biden administration’s...