A day before six career federal prosecutors resigned in protest over the Justice Department's handling of the killing of Renee Good in Minneapolis, lawyers in the office had a conversation with Gregory Bovino, the Border Patrol field leader, that left them deeply unsettled. According to several people with knowledge of the telephone conversation, which took place on Jan. 12, Mr. Bovino made derisive remarks about the faith of the U.S. attorney in Minnesota, Daniel N. Rosen. Mr. Rosen is an Orthodox Jew and observes Shabbat, a period of rest between Friday and Saturday nights that often includes refraining from using electronic devices. Mr. Bovino, who has been the face of the Trump administration's immigration crackdown, used the term "chosen people" in a mocking way, according to the people with knowledge of the call. He also asked, sarcastically, whether Mr. Rosen understood that Orthodox Jewish criminals don't take weekends off, the people said.