Senator Jeff Flake, Republican of Arizona, an outspoken critic of Mr. Trump who plans to skip the convention, said more bluntly that the party should be prepared to break with Mr. Trump and the voters who have cheered his pledges to deport millions of undocumented immigrants and ban Muslims from entering the country.
“You’ve got to hope that, if this race keeps going the way it looks to be going, that it’s enough of a jolt to wake people up and say we don’t want to be relegated to second place in every future presidential campaign,” Mr. Flake said.
He suggested a purge of racists from the party that would recall the expulsion of the John Birch Society, a fringe nationalist group, from Republican ranks a half-century ago.
“Those who want a Muslim ban, those who will disparage individuals or groups — yes, we ought to, we need to,” Mr. Flake said.
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