The No. 2 official at the Homeland Security Department meddled in three high-profile immigration cases, giving special treatment to applications from wealthy and well-connected immigrants after calls from major Democrats despite the objections of career employees, the department’s inspector general concluded in a report Tuesday. Alejandro Mayorkas, who was elevated from head of the department’s legal immigration agency to be deputy secretary while the investigation was ongoing, also angered many of his colleagues by getting involved in the cases, and “created an appearance of favoritism and special access” for the wealthy immigrants, the inspector general concluded. Inspector General John Roth...