The crime is defined in 18 U.S. Code sec. 912 as follows: "Sec. 912. - Officer or employee of the United States Whoever falsely assumes or pretends to be an officer or employee acting under the authority of the United States or any department, agency or officer thereof, and acts as such, or in such pretended character demands or obtains any money, paper, document, or thing of value, shall be fined under this title or imprisoned not more than three years, or both"
Supreme Court rejects plea for freeze on expansion of asylum seekers' detention (Haaretz)