I am old enough to recall when they did so post-9/11.
The US government would never give up such a capability, that would be out of character for them. But they would sure as hell pretend like they did, which is very much in character.
I think they would. There's at least 3 fully operational GPS alternatives, there's no reason to have this capability anymore. Some receivers will combine all of these systems.
All these systems are rigged to jam and spoof at the push of a button I expect.
They are owned by: China, Russia, India, Europe and Japan.
There was a specific technical capability that they used to reserve the right to use, and I believe they no longer need to use that capability. Obviously this would only be the case if they have some alternative capability. But I forget the name of the feature so I am having trouble looking up sources. I obviously do not take the government at its word, but I can believe that a technical capability developed in the 1980's might no longer be the most useful counter measure. Especially since there are now 5 GNSS constellation systems, with GPS only being one of them, and low cost off the shelf receivers can read all of them.