WASHINGTON — Taking an important step on the thorny path to closing the U.S. detention facility at Guantanamo Bay, Cuba, the White House plans to announce Tuesday that the government will acquire an underutilized state prison in rural Illinois to be the new home for a limited number of terrorist suspects held at Guantanamo.

Administration officials as well as Illinois Sen. Richard Durbin and Illinois Gov. Pat Quinn will make an official announcement at the White House.

Officials from both the White House and Durbin’s office confirmed that President Barack Obama had directed the government to acquire Thomson Correctional Center in Thomson, Ill., a sleepy town near the Mississippi River about 150 miles from Chicago. The officials spoke on the condition of anonymity to avoid pre-empting Tuesday’s announcement.

A Durbin aide said the facility would house federal inmates and no more than 100 detainees from Guantanamo Bay.

The facility in Thomson had emerged as a clear front-runner after Illinois officials, led by Durbin, enthusiastically embraced the idea of turning a near-dormant prison over to federal officials.

The White House has been coy about its selection process, but on Friday a draft memo leaked to a conservative Web site that seemed to indicate officials were homing in on Thomson.

The Thomson Correctional Center was one of several potential sites evaluated by the Federal Bureau of Prisons to potentially house detainees from the Navy-run prison at Guantanamo Bay. Officials with other prisons, including Marion, Ill., Hardin, Mont., and Florence, Colo., have said they would welcome the jobs that would be created by the new inmates.

Closing Guantanamo is a top priority for Obama, and he signed an executive order hours into his presidency directing that the process of closing the prison begin. Obama has said he wants terrorism suspects transferred to American soil so they can be tried for their suspected crimes.

The Thomson Correctional Center was built by Illinois in 2001 as a state prison with the potential to house maximum security inmates. Local officials hoped it would improve the local economy, providing jobs to a hard-hit community. State budget problems, however, have kept the 1,600-cell prison from ever fully opening. At present, it houses about 200 minimum-security inmates.

NY TIMES:  Obama administration officials argue that the prison would be secure and that it would enhance national security to close Guantánamo because it has become a global symbol and a recruiting tool for Al Qaeda.

Mr. Obama declared shortly after his inauguration that he would close the Guantánamo prison — a signature component of the Bush administration’s counterterrorism policy — within a year. But dealing with the roughly 200 detainees at the prison has proved difficult, and he is widely expected to miss that deadline.

In May, Mr. Obama proposed bringing some detainees to a facility inside the United States, including some who officials have decided are too difficult to prosecute and too dangerous to release. They would continue to be held without trial as “combatants” under the laws of war.

Under the proposal for Thomson, the Bureau of Prisons would buy the facility and improve its security. Most of the prison would house ordinary high-security inmates, but a part would be leased to the Defense Department to hold terror suspects.

It was not immediately clear how the government would pay for the prison and upgrades, but White House officials have floated the idea of including financing for it in the 2010 military appropriations bill.

Earlier this year, Congress enacted a law forbidding Guantánamo detainees to be brought onto United States soil except for the purpose of prosecution. But leading Democrats said they were open to lifting that restriction after the administration came up with a plan for how to handle the prisoners.