Fair enough, if they've found holes that Huawei won't fix....
...but of course, are the TLAs (or in GCHQ's case FLA) able to guarantee that they've looked in similar detail at the competing hardware that will be used instead, and they can currently assure us that all the issues that such an examination would find have been fixed?
Oh, silly me. Of course they haven't, and they don't care. This is politics, not technology.
The unfortunate thing is that with zero compelling evidence, the West is busy giving Huawei a kicking. If deserved, I'd be happy to accept whatever consequences there will be. But if this is (as I suspect) pure politics driven by US bureaucrats, we can expect a range of Western companies to run into undeserved trouble not just in China, but any market where Chinese money speaks.
Biting the hand that feeds IT
