“Trump might have considered this idea only as a ploy to catch leakers”
If so, it may serve to make others take pause in the future.
It has been lawless open season on conservatives for years under Obama - many leftists have lost (or never learned) the fear of being punished for crime.
One head on a pole will deter many others.
I agree.
The possibility of some identifiable difference from document to document or even information item to information item would give many pause.
Now, how to catch intercept leakers from NSA to agencies?