A federal magistrate judge raised concerns on Monday that the man accused of trying to kill President Trump and top cabinet members at an annual press gala had been placed in unusually punitive detention for days while awaiting next steps in court. During a hastily scheduled hearing in Washington, Magistrate Judge Zia M. Faruqui demanded answers about how the man had been placed on suicide watch, denied a number of basic services and held in what the judge called “effectively solitary confinement” for nearly a week, all while the government has been slow to establish key facts in the federal...