An al-Qaeda suspect is to become the first Guantanamo inmate to stand trial in a US civilian court, reports say.
Ahmed Ghailani will be sent to New York to face charges over the 1998 US embassy bombings in East Africa, the White House is expected to announce.
The news comes as the US Senate voted against funding President Obama’s plans to close down Guantanamo Bay detention centre and transfer its 240 detainees.
Mr Obama is due to address concerns in a major speech later on Thursday.
He is under pressure from both Democrats and Republicans over his pledge to shut the camp in Cuba by January 2010.
At the same time, former vice-president Dick Cheney is due to give his own address – explaining why President Obama’s national security policies are leaving Americans less safe.
Officials, on condition of anonymity, told US media the Obama administration would announce that Ahmed Ghailani will be sent to New York City for trial.
They did not specify when that might be.
Ghailani, a Tanzanian, was seized in Pakistan in 2004 and was one of 14 so-called “high-value detainees” transferred from secret CIA prisons abroad to Guantanamo in September 2006.
He was indicted in New York on charges related to the August 1998 bombing of the US embassies in Tanzania and Kenya that killed more than 200 people.
According to the transcript of a closed-door hearing in March 2007, Mr Ghailani admitted delivering explosives used to blow up the US embassy in Dar Es Salaam.
However, he told the hearing he did not know about the attack beforehand and apologised to the US government and the victims’ families.
The expected announcement comes as Tanzania’s President Jakaya Kikwete is to hold talks with President Obama – the first African head of state to meet the new US leader in Washington.
The issue of transferring Guantanamo Bay inmates to the US has caused alarm among many members in Congress.
“The American people don’t want these men walking the streets of America’s neighbourhoods,” Republican Senator John Thune said on Wednesday.
“The American people don’t want these detainees held at a military base or federal prison in their backyard, either.”
President Obama’s request for $80m (£51m) to close the camp was overwhelmingly rejected by senators by 90-6 votes.
The House of Representatives made a similar decision.
Democrats and Republicans each argue that there needs to be a better plan for closing Guantanamo.
The Republicans want to see the camp remain open, while the Democrats are asking the president for a plan of the closure process before agreeing to fund it.
Concerns will not be eased by a New York Times report on Thursday, which quoted an unreleased Pentagon report as saying that one in seven of the 534 prisoners already transferred abroad from Guantanamo Bay have returned to terrorism or militant activity.
The BBC’s Jonathan Beale in Washington says President Obama will have to use his speech to explain to the American people why it is important to close Guantanamo Bay and why this is not the right place for the detainees.
The detention centre, on US territory in Cuba, was established after the 9/11 attacks by the then President, George W Bush.
In one of his first acts on taking office, President Obama pledged to close the camp by January 2010.
He also halted the Bush-era military commissions, saying the US was entering a new era of respecting human rights.
Last week, he announced he would revive the military tribunal system for some Guantanamo detainees but with greater legal rights for defendants.
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