“If a 16 year old with Aspergers can break into US defence computers, what is to stop a Chinese company putting in trap doors that it can activate whenever it wants?
For readers on this side of the Atlantic, there is also some value in being shown how explicit, and serious, Americans like to be about moral questions.
It’s hard to see enough Republican legislators backing it, but don’t put it past the President to change that.
The President’s decision has aroused concern in both parties, and drawn attention once again to an issue he is desperate to shake off.
Trump has already fallen out with parts of the intelligence and security services – and risks a rift over Russia with his own party too.