According to Aid , the White House 's rejection of Blair 's attempt to bring the appointment of station chiefs under the DNI 's authority soured Blair 's relationships with Panetta , despite a long personal friendship between the two , and Obama 's Homeland Security Advisor , John Brennan , who had sided with Panetta in the dispute ( Brennan later succeeded Panetta as Director of the CIA ) . When it was discovered that the November 2009 Fort Hood shooting and the attempted bombing of Northwest Airlines Flight 253 a month later could have been prevented with better interagency intelligence sharing , Brennan and Panetta allegedly blamed Blair ( which , according to Aid , was not justified ) , resulting in Obama 's decision to replace him
2009 Fort Hood shooting
2009 Fort Hood shooting
Dennis C. Blair