"The Bush administration has described a report by Amnesty International that accuses it of leading a decline in human rights standards, as ridiculous.
The human rights watchdog's annual report on human rights says the US sets the standard for other nations.
"The USA as the unrivalled political, military and economic hyper-power sets the tone for governmental behaviour worldwide," secretary-general Irene Khan said.
"When the most powerful country in the world thumbs its nose at the rule of law and human rights, it grants a licence to others to commit abuse with impunity."
White House spokesman Scott McClellan says the report is offensive.
"I think the allegations are ridiculous and unsupported by the facts," he said.
He says the US holds people who are accused of abuse.
"We do so in a very public way for the world to see that we lead by example and that we do have values that we hold very dearly and believe in," he said.
About 540 prisoners are held at a US detention centre in Guantanamo Bay, Cuba.
Many have been there for three years without charge."
Unsupported by the facts?
...-Gixer