Huawei's US chief security officer makes the case for its lawsuit

Huawei is stepping up its legal defense against the United States. The company filed a lawsuit against the U.S. alleging that a law that bans government agencies from buying Huawei equipment is unconstitutional. Andy Purdy, chief security officer of Huawei Technologies U.S., and Glen Nager, partner at Jones Day and lead outside counsel for Huawei, join "Squawk Box" to discuss.