Supreme Court Justice Antonin Scalia is joining the debate over the Senate's torture report by saying it is difficult to rule out the use of extreme measures to extract information if millions of lives were threatened.

Scalia tells a Swiss radio network that American and European liberals who say such tactics may never be used are being self-righteous.

The 78-year-old justice says he doesn't "think it's so clear at all," especially if interrogators were trying to find a ticking nuclear bomb.

Scalia says nothing in the Constitution appears to prohibit harsh treatment of suspected terrorists.

The interview took place at the court on Wednesday, the day after the release of the Senate report detailing the CIA's harsh interrogation of suspected terrorists. 

Radio Television Suisse aired the interview on Friday.