Risen was subpoenaed twice to disclose his sources for the book, first by the George W. Bush administration and then by the Barack Obama administration. Risen declined to do so both times, but in January 2011, it was claimed that former CIA agent Jeffrey Alexander Sterling had illegally leaked classified information to Risen about the agency's involvement in Iran's nuclear program.[1][3][4] Sterling was convicted and served two years in prison; he maintains his innocence.[5]