After the US claimed that Huawei was a national security threat only to drop this claim completely when China started cooperating on trade talks I honestly don't know what to believe anymore.
The point is that any foreign company becomes a national security threat if it's big enough and it threats the domestic player. It's really all about power(economic and technological).
FCC is actively pursuing removal of Huawei and ZTE equipment under a threat to national security.
https://techcrunch.com/2019/10/28/fcc-rules-huawei-zte/