Jeb Bush suggested on Tuesday that Donald J. Trump’s strategy, as he rides to the top of polls, was to “prey” on the “fear and angst” of the American electorate, and Mr. Bush reiterated his view that many illegal border crossings by migrant parents were “an act of love.” During an interview with the Southern Baptist Convention in Nashville, Mr. Bush was asked about Mr. Trump’s surging political fortunes before the first major Republican presidential debate on Thursday. Mr. Trump’s “harsh tone is wrong,” Mr. Bush said. Many Americans are alienated and angry, he said, adding, “They see America moving...