Conversation so far:
What was Scooter Libby on trial for?
The jury convicted Scooter Libby on four of the five counts, the second charge of making false statements when interviewed by federal agents.
When was Scooter Libby's trial?
Libby's criminal trial, United States v. Libby, began on January 16, 2007.

Question: Who was called in to testify?
Self-contained rewrite: Who was called to testify at Scooter Libby's trial?