His record on Wikipedia: In an interview on December 20, 2010 with Diane Sawyer of ABC News, Clapper was completely unaware that twelve alleged would-be terrorists had been arrested in Great Britain earlier in the day.
In March 2011, Clapper was heard at the United States Senate Committee on Armed Services and commented on the 2011 Libyan civil war that over the longer term Gaddafi will prevail. This position was loudly questioned by the White House, when National Security Advisor Thomas E. Donilon qualified his statement as a “static and one-dimensional assessment” and argued that The lost legitimacy [of Gaddafi] matters”. During the same hearing he was also questioned when he neglected to list Iran and North Korea among the nuclear powers that might pose a threat to the United States.
President Obama made the official announcement on June 5, 2010 saying Clapper “possesses a quality that I value in all my advisers: a willingness to tell leaders what we need to know even if it’s not what we want to hear.” 
He was (again) completely clueless as to what had happened earlier in the UK. After a very long pause he asked Sawyer "London?".
This guy has no business being in intelligence, not to mention commenting on this administrations bumbling of intelligence. Mark Steyn labeled this fool an "idiot", correctly.