The White House on Friday released the border briefing President Trump tried to get Democratic leaders to see during a meeting earlier this week, saying the public should see the information behind the president’s case for why he wants a border wall. The briefing, which was to be given by Homeland Security Secretary Kirstjen Nielsen, details increases in drug seizures, arrests of criminals and the surge of illegal immigrant children and families who the administration says are overwhelming agents. But attendees said Democrats’ top leaders interrupted Ms. Nielsen and wouldn’t let her give the briefing. “Some of those present did...