有明文规定的

https://share.america.gov/zh/%E7%BE%8E%E5%9B%BD%E8%81%94%E9%82%A6%E6%94%BF%E5%BA%9C%EF%BC%9A%E4%B8%89%E6%9D%83%E5%88%86%E7%AB%8B%E4%B8%8E%E5%88%B6%E8%A1%A1/

https://en.m.wikipedia.org/wiki/Federal_judiciary_of_the_United_States