Civil liberties groups have reacted angrily to US President Barack Obama's decision to revive military trials for some Guantanamo Bay detainees.

公民自由组织对美国总统奥巴马决定重新启动关塔那摩湾被拘留者的军事尝试非常不满。

Barack Obama branded the original military trials an enormous failure

Mr Obama has previously¹ denounced（告发，公然抨击） the Bush-era judicial² system, but in a statement said new safeguards would ensure suspects got a fairer hearing.

New rules include rejecting statements obtained（获得） from harsh interrogations（审问） and limitations on using hearsay³ evidence（非直接证据，传闻证据）.

There are still 240 detainees at the US base in Guantanamo Bay, Cuba.

Mr Obama halted the controversial military commissions as one of his first acts on taking office in January, saying the US was entering a new era of respecting human rights.

"It's disappointing that Obama is seeking to revive（使酒醒） rather than end this failed experiment," said Jonathan Hafetz, a national security attorney at the American Civil Liberties Union.

"There is no detainee（被拘留者，未判决囚犯） at Guantanamo who cannot be tried and shouldn't be tried in the regular federal courts system. This is perpetuating⁴ the Bush administration's misguided detention⁵（挽留，延迟） policy."

Kenneth Roth, head of Human Rights Watch, said: "By resurrecting（复活） this failed Bush administration idea, President Obama is backtracking dangerously on his reform agenda."

Campaign statement

On the campaign trail（竞选旅行） last year, Mr Obama had branded（烙印） the military commissions "an enormous failure".

But in the statement issued on Friday, he said he had supported their use as one avenue to try detainees, and in 2006 had voted in favour of them.

He said he had opposed the tribunals（法院，法庭） used by George W Bush's administration because they had failed to establish a legitimate⁶（合法的，正当的） legal framework and undermined swift and certain justice.

The extra safeguards for detainees include a ban on evidence obtained by harsh interrogation; restrictions⁷ on hearsay evidence; giving detainees more leeway（活动余地） to choose their own lawyers and protecting detainees who refuse to testify, the statement said.

Mr Obama said he was seeking more time so that the new procedures could be implemented⁸（应用）.

"These reforms will begin to restore the commissions as a legitimate forum⁹ for prosecution¹⁰, while bringing them in line with the rule of law," he said.

"This is the best way to protect our country, while upholding our deeply held values."

But Geneve Mantri, of Amnesty International, said Mr Obama's message was confusing.

"It was clear from his announcements soon after he reached the White House what he was going to do," he said.

"Now it is somewhat confusing what the administration's standard is or what their policies are."

Zachary Katznelson of Reprieve¹¹, which represents a number of Guantanamo Bay detainees, told the BBC that the president was making a "fundamental mistake".

"He is taking a gravely, truly flawed system, tinkering at the edges and hoping that the world is somehow going to see this as legitimate, as open, as fair - it's not going to happen," he said.

In contrast, Mr Obama found support for his decision among his opponents.

"I am pleased that President Obama has now adopted this view," said Republican Senator John McCain, who lost the presidential election to Mr Obama.

Ari Fleischer, who was George W Bush's first press secretary, said President Obama "should acknowledge his campaign criticisms were wrong".

"With some minor¹² changes, he really is following the same path President Bush pursued," he said.