Trump administration officials fired more than 300 staffers Thursday night at the National Nuclear Security Administration — the agency tasked with managing the nation’s nuclear stockpile — as part of broader Energy Department layoffs, according to four people with knowledge of the matter. Sources told CNN the officials did not seem to know this agency oversees America’s nuclear weapons. An Energy Department spokesperson disputed the number of personnel affected, telling CNN that “less than 50 people” were “dismissed” from NNSA, and that the dismissed staffers “held primarily administrative and clerical roles.” The agency began rescinding the terminations Friday morning. Some...