A federal appeals court ruled on Friday that a Guantanamo prisoner accused of being Osama bin Laden's bodyguard could be tried by a military tribunal, reversing a lower court decision that such a trial was unlawful and would violate his rights.
In a victory for the government, the three-judge panel said the military tribunal process at the US naval base at Guantanamo Bay, Cuba, was the proper forum for Salim Ahmed Hamdan to be tried.
If Mr Hamdan were convicted, he could then contest his conviction in federal court after exhausting his options through the military justice system, the panel said.
The ruling means that Mr Hamdan's case, which was halted in November, can continue. Three other prisoners have also been charged and referred to the commission for the tribunal process. Attorney General Alberto Gonzalez said in a statement he was pleased with the ruling.
"The president's authority under the laws of our nation to try enemy combatants is a vital part of the global war on terror, and today's decision reaffirms this critical authority," Mr Gonzalez said.
Mr Hamdan has been charged with conspiracy to commit attacks on civilians, murder, destruction of property and terrorism. Mr Hamdan is also accused of being bin Laden's personal driver in Afghanistan between 1996 and November 2001.
Mr Hamdan's trial was halted by a district court judge who declared the military tribunal procedures unlawful. US District Judge James Robertson had ruled that the trial could not proceed until a decision had been made on whether Mr Hamdan was a prisoner of war under the Geneva Conventions.
The appeals court said that ruling was wrong, and said the Geneva Conventions do not help Mr Hamdan.
"One problem for Hamdan is that he does not fit the ... definition of a 'prisoner of war' entitled to the protection of the convention," Judge A. Raymond Randolph wrote in a 20-page ruling.
"Another problem for Hamdan is that the 1949 Convention does not apply to al Qaeda and its members."
The military tribunals, formally called a military commission, were authorized by President George W.Bush after the September 11th, 2001, attacks.