Congressional aides to Sens. Dianne Feinstein, the chairwoman of the Senate Intelligence committee, and John McCain, a member of the Armed Services panel, said the lawmakers joined McDonough on the trip.
The visit today comes as President Barack Obama has renewed his 2008 campaign promise to close the naval facility that houses 166 terror suspects. White House spokeswoman Caitlin Hayden said McDonough wants to review the situation at the prison and discuss how to work with Congress to meet the president's goal of closure.