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."
Lawyer and legal analyst Lisa Bloom has said that there is a good chance Amanda Knox could face extradition to Italy, saying: "I think it's certainly possible...If the conviction is upheld I would expect Italy to want to extradite her, after all she's been convicted of murder there."
The judge who presided over Amanda Knox's second murder conviction said he suffered over the verdict but that he and the jury agreed about her guilt in the death of British student Meredith Kercher.
Judge Alessandro Nencini told the Italian newspaper Corriere della Sera the jury had come up with a motive that would be explained in the written explanation of the verdict, expected within three months.
John Kercher, whose daughter Meredith was killed in 2007, told ITV News that there is nothing to celebrate today: "You don't celebrate guilty - you celebrate closure and we still don't have that.
"That's all we want. We want it to end. It's been over six years and we still have another judicial process ahead now."
He added that the American media were jumping to conclusions when they say Amanda Knox could escape extradition under the double jeopardy law."They have not been tried twice so double jeopardy should not come into this."There has only been one actual trial. This was an appeal being re-done.
"Now they can take this to the Supreme Court... to say they have been tried for the same crime twice is not right."
Meredith Kercher's sister Stephanie and brother Lyle have spoken to the media after Amanda Knox and Raffaele Sollecito have had their guilty verdicts for the murder of the British student reinstated by judges.
They said that they are "still on the journey to the truth" and that America "should extradite" Knox.
Lyle Kercher says that nothing will bring his sister Meredith back and that Amanda Knox should be extradited from America. He told a press conference:
"Nothing will bring her back. We want this to come to an end. If she has been found guilty she should be extradited. America will set a difficult precedent if they don't stand by the rules they expect others to abide by."
Meredith Kercher's sister Stephanie said the guilty verdict is 'the next step' for the family in getting to the end of the case.
Speaking to reporters she said: "For us as a family the guilty verdict is the next step for us. It contributed to the Italian legal system, again we will have to wait for the report in 90 days to see the reasoning, but it is the next step to hopefully get to the end for us."
Speaking before the verdict was read out, Amanda Knox said: "I'm definitely not going back willingly. They will have to catch me and pull me back kicking and screaming into a prison that I don't deserve to be in."
Ms Knox was speaking in an interview recorded for the BBC's Newsnight programme before both she and Raffaele Sollecito were found guilty of the murder of British student Meredith Kercher after judges in Florence overruled their previous acquittal.