“Mass Deportation Now!” declared the signs at the Republican National Convention, giving a full embrace to Donald Trump’s pledge to expel millions of migrants in the largest deportation program in American history. Some Republicans aren’t quite ready for that. Lauren B. Peña, a Republican activist from Texas, said that hearing Trump’s calls for mass deportations, as well as terms like “illegals” and “invasion” thrown around at the convention, made her feel uncomfortable. ... “He’s not meaning to go and deport every family that crosses the border, he means deport the criminals and the sex offenders,” Peña said. But Trump and...