At least six senior FBI leaders have been ordered to retire, resign or be fired by Monday, according to sources briefed on the matter, extending a purge that began last week at the Justice Department across the street from the FBI headquarters. The senior officials are at the executive assistant director level or special agent in charge level and include those who oversee cyber, national security and criminal investigations, the sources told CNN. Some were notified while Kash Patel, President Donald Trump’s pick to lead the agency, sat answering questions from senators for his confirmation hearing Thursday. Trump transition officials...