Blair, a retired Navy admiral, is the third director of national intelligence, a position created in response to public outrage over the failure to prevent the Sept. 11, 2001, terrorist attacks.
His departure underscores the disorganization inside the Obama administration's intelligence apparatus, rocked over the past six months by a spate of high-profile terror attacks that revealed new national security lapses. And it comes two days after a stark Senate report criticized Blair's office and other intelligence agencies for new failings that, despite a top-to-bottom overhaul of the U.S. intelligence apparatus after 9/11, allowed a would-be bomber to board a Detroit-bound airliner on Christmas Day.
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In a message Thursday to his work force, Blair said his last day would be May 28.
"It is with deep regret that I informed the president today that I will step down as director of national intelligence," Blair said.
