For one they are a Chinese company and Chinese and tech you're just asking for data theft and espionage .
Indictment coverage
https://www.cnn.com/2019/01/29/tech/us-indictment-huawei-takeaways/index.html
Actual DOJ Indictment
https://www.justice.gov/opa/press-release/file/1124996/download
Indictment coverage
https://www.cnn.com/2019/01/29/tech/us-indictment-huawei-takeaways/index.html
Actual DOJ Indictment
https://www.justice.gov/opa/press-release/file/1124996/download