Senior White House officials worked with House Republicans for weeks on a compromise immigration measure, but were careful to avoid saying anything publicly that would sink the measure. That changed Friday morning when President Donald Trump walked out to the White House’s North Lawn. House Republicans reached agreement on a sweeping immigration overhaul measure after conservatives, moderates and leaders negotiated behind closed doors for weeks — with White House legislative affairs director Marc Short also involved. Members said Thursday they had reached a deal to vote on two measures: a measure favored by conservatives and a compromise version in which...