The Obama administration could transfer Guantanamo inmates to be tried and detained at a hybrid military-civilian prison in the United States as part of a proposal being examined by U.S. security agencies, officials said Sunday. The proposal for creating a combined detention and trial facility for Guantanamo inmates in an existing U.S. maximum security prison figures to be controversial. Congress has opposed bringing detainees to the United States, despite President Barack Obama's vow to close the naval prison in Cuba by January. Officials at the White House, Justice Department and other agencies confirmed the idea of a 'courtroom within a detention facility' was being examined. But officials emphasized that nothing had been decided and that other options are under consideration by a multi-agency task force studying detainee issues. 'No decisions have been made,' White House spokesman Ben LaBolt said. A spokesman at the Justice Department, which is leading the task force, also said that no decisions had been made about whether to establish such a facility. An Obama administration official said the task force was considering a wide array of options and was expected to make its recommendations as early as this month. The proposal was first reported Sunday by the Associated Press. There are 229 inmates at the detention facility at Guantanamo Bay, Cuba, who are accused of belonging to al-Qaida, allied extremist networks or the Taliban. U.S. officials hope to prosecute some of them in federal court and others before military commissions. But complex questions must be resolved as part of the process of shutting down the base. About 60 prisoners have been cleared for release but cannot be sent to their homelands because of fears they would be persecuted. The administration has been trying to convince European allies to take in some in that group, although the U.S. has not accepted any. Several European governments have been reluctant because of the cost, political sensitivity and potential security risks. U.S. law enforcement officials are also wrestling with decisions about the fate of suspected terrorists who are considered too dangerous to release but cannot be prosecuted because evidence is weak or has been tainted by alleged abuse. When Congress passed a war-funding bill this year, it omitted the $80 million Obama requested to close Guantanamo. The measure also bars the administration from releasing detainees to freedom in the United States, at least until Sept. 30. It would, however, allow the administration to bring certain prisoners to U.S. jails for pretrial detention. The Obama administration is looking at civilian and military facilities in the United States to house the detainees. 'It is no secret the administration is considering bringing the detainees to the U.S.,' said a government official, who asked to remain anonymous because he was not authorized to discuss the internal deliberations. The task force has been looking at a number of unused or underused civilian facilities, including a soon-to-be-closed maximum security prison in Michigan. In fact, a source close to the deliberations said the courtroom-within-a-prison plan was floated in May 2009 by Michigan Republicans, including former Gov. John Engler, suggesting a site in their state. The Associated Press reported Sunday that the facility was the Standish maximum security prison in northeast Michigan. But that option has been rejected at least for now, the government official told the Los Angeles Times. The Pentagon has also examined the detention facilities at Fort Leavenworth, Kan.; Camp Pendleton, Calif.; and the Charleston, S.C., naval brig. But the government official said those facilities were not designed as supermax security. 'None of them are ideal options,' the official said. The proposed hybrid facility would be operated jointly by the departments of Justice, Defense and Homeland Security, officials said. But many delicate issues need to be decided before such a plan goes forward, such as choosing a site that does not cause too much political opposition, especially among Republicans who say it would jeopardize Americans by making the prisons targets of terrorist attacks. Logistical problems such as where judges and prosecutors would come from are also under discussion by the task force, according to the source familiar with its deliberations. The American Civil Liberties Union said it would oppose such a facility, especially if it included holding some detainees indefinitely without charge or trial, which the Obama administration has indicated it probably would support. 'Closing Guantanamo will be an empty gesture if we just reopen it on shore under a different name,' Jameel Jaffer, director of the ACLU National Security Project, said in a statement. 'While it's encouraging that the administration is attempting to meet the deadline for closing Guantanamo, any arrangement that allows indefinite detention without charge or trial will leave in place the problems that led President Obama to order the prison closed in the first place.' Jaffer said federal courts 'have shown themselves capable of handling complex terrorism prosecutions while affording defendants the procedural protections that the Constitution requires.' Staff writer Sebastian Rotella in Washington contributed to this report. 