They probably have him on wiretap and let him know about it, or started asking questions that "reminded" him of the event.

Personally, I think this is the way politics work in most situations. What disturbs me is the extent of the wiretaps. I wonder who else is tapped?

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles