A White House official has declined to comment when pressed on the possible extradition of Amanda Knox to Italy.
A spokesman said: "This is a matter, as I understand it from my reading of the press, is still in a legal proceeding.
"For questions about that issue, I would refer you, as a broad principle as opposed to a matter that is still in a legal process, I would refer you to the State Department and the Department of Justice."
More top news
Brian John Carron was arrested over the seizure of ammunition and weapons in 2011.
The exchange was the biggest flare-up between the sides in weeks.
A report found that just six out of 96 top leaders at the corporation were non-white men.