Attorney General Eric Holder says no detainees from Guantanamo Bay will be brought to an Illinois prison originally intended to help close Gitmo.

In a letter addressed to Democratic Sen. Dick Durbin, Holder said Monday the administration won’t bring detainees to the prison. Illinois officials wanted assurances after federal funding for Thomson — originally touted as a location of “Gitmo north” — was held up by lawmakers who did not want suspected terrorists housed on U.S. soil.

Thomson prison is a 1,600 cell prison about 150 miles west of Chicago. President Barack Obama’s 2011 budget includes $170 million to acquire the prison and turn it into a federal maximum security facility, but the purchase has not been completed because Congress has yet to pass a 2011 budget.