2. Paul Ryan, the speaker of the House, promised that Republicans would draft legislation on immigration for a floor vote in the coming weeks.

That sets up a showdown on one of the thorniest political issues just as the midterm campaigns come into focus.

Any vote on a bill deemed “amnesty” by the party’s right flank could demoralize conservative voters in November. On the other hand, the failure of moderates to win support for the Dreamers could harm their chances in the districts most targeted by the Democrats.