detainees to be sent to prisons on u.s. soil. however, that practice has been banned by congress and 2011. in his speech today, obama talked about the cost of keeping one, going. the u.s. spends $450 million every year to detain the prisoners. our correspondent has this report on a plan that was first proposed almost eight years ago. president obama: there we go. reporter: one of barack obama pass first acts as president was to sign an executive order to close guantanamo bay. he has been trying to shut the prison since then, those ideas walked by republican lawmakers. with the end of his presidency insight, obama has been giving it another go. president obama: it is clear the prison at guantanamo bay does not advance our national security. it undermines it.