Rudolph W. Giuliani says that the FBI secretly spied on his Apple iCloud account beginning in late 2019 when he was having regular messaging conversations with his client, President Trump, during House impeachment proceedings. Mr. Giuliani said the U.S. Attorney’s Office in Manhattan on Thursday informed his attorney, Robert Costello, that covert wiretapping took place. Mr. Giuliani, once the mob-fighting top prosecutor in New York and then the city’s mayor, said an assistant U.S. attorney made the disclosure because the operation will have to be detailed in court. The penetration happened under the Trump administration and then-Attorney General William P....