lists provided. They were also able to view Levinson's signature from the hotel check-out bill on March 9. Iranian officials promised to provide an investigative report to the family, but have yet to do so. In July 2008 and subsequent interviews, Christine and Dan said they wanted to travel to Iran again soon. Proof of life According to the Associated Press, Levinson's family received "irrefutable proof" of life late in 2010. On December 9, 2011, the family released a hostage video they received in November 2010. In the video, Robert appears to have lost considerable weight, and repeatedly pleads for help in returning home. On January 8, 2013, Levinson's family released photos to the media showing the former agent in an orange jumpsuit with overgrown and unkempt hair. A family spokesman told CNN the photographs were received in April 2011. CNN reported: "Asked why the family is releasing the images now, more than 18 months later, the spokesman said: 'The family is anxious that not enough is being done. There is frustration with the lack of progress on the case.'" U.S. government investigation In June 2007, President George W. Bush released a statement on Levinson's case, saying: "I am ... disturbed by the Iranian regime's refusal so far to provide any information on Robert Levinson, despite repeated U.S. requests. I call on Iran's leaders to tell us what they know about his whereabouts." On January 13, 2009, U.S. Senator Bill Nelson revealed during Hillary Clinton's confirmation hearing that he believes Robert Levinson is being held in a secret prison in Iran. "The door has been closed at every turn," Nelson said during Clinton's confirmation hearing. "We think he is being held by the government of Iran in a secret prison." According to The New York Times, Levinson had been meeting with Dawud Salahuddin, (an American convert to Islam wanted for the 1980 murder of an Iranian dissident in the US) "just before he went missing". On March 8, 2013, the Obama administration released a statement to mark the sixth anniversary of Levinson's disappearance. Press Secretary Jay Carney said, Finding him remains a high priority for the United States, and we will continue to do all that we can to bring him home safely to his friends and family, so they may begin to heal after so many years of extraordinary grief and uncertainty. The Iranian Government previously offered assistance in