The issues, which Trade Representative Lightheiser has again listed in recent days, are nothing new. It seems, indeed, a national security flaw to allow cheap (because capital- and contract-subsidized) cell infrastructure into western economies. On top of those realities, Chinese law requires explicitly that HuaWei do the Party Chairman's bidding when commanded. I say let Germany be the guinea pig in the matter, if they're so publicly sceptical.
The same goes for the national security implications of having foreign-company cars "built" in the US or UK when the engines and transmissions are built elsewhere: Such a practice really does bleed a nation not only of essential factories, but essential skills in the labor force.
Germany sloppily allowed the sale of Kukus robotics. Now it has panicked as an ever-larger percentage of Daimler shares falls into Chinese hands. Germany is a good example of nothing except "wishful thinking about the glories that will fall to them from that enormous Chinese market."