Jeff Johnson was the assistant to Mac McConnell, the Deputy Chief of Staff in the administration before Bartlet.
Following the 1998 election, he invited his successor Donna Moss out to lunch and showed her around the West Wing. He told her there were nuclear missiles underneath the Eisenhower Putting Green, then asked her to give an interview to his girlfriend at 21 magazine. Donna fell for their prank, and it was published in the magazine.