Although ZTE can sell its products to the civilian consumers all over the US, a recent bill that was signed by Donal Trump bans the government use of any device made by the Chinese brand due to security issues. Even more, this bill also forbids the use of Huawei hardware for the same reason.
https://www.notebookcheck.net/No-Huawei-and-ZTE-handsets-for-the-US-government-decides-President-Trump.323052.0.html