A book by a former top federal prosecutor offers new details about how the Justice Department under President Trump sought to use the US attorney’s office in Manhattan to support Trump politically and pursue his critics — even pushing the office to open a criminal investigation of former secretary of state John Kerry. The prosecutor, Geoffrey S. Berman, was the US attorney for the Southern District of New York for 2 1/2 years until June 2020, when Trump fired him after he refused a request to resign by then-Attorney General William Barr, who sought to replace him with an administration...