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A White House spokesman wouldn't say Monday when the Obama administration will present Congress with a plan to close the military prison at Guantanamo Bay, Cuba, but said a plan would be put forward "relatively soon."

"I wouldn't put a timeframe on it," White House spokesman Josh Earnest said on Monday. "This is something that obviously we've been working on for some time" and "a lot work" has gone into the planning. That work includes scoping out possible sites in Colorado, Kansas and South Carolina to house the remaining 112 prisoners who are thought to have some tie to terrorist groups.

"So, there's been some legwork on this project that's been visible," he said.

Earnest reiterated that the plan is to work with Congress to shutter the facility, but again left open the possibility of looking for other ways if lawmakers don't cooperate.

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