WASHINGTON (CNN) - Director of National Intelligence Michael McConnell has resigned effective immediately, DNI spokesman Ross Feinstein said Tuesday.
Lt. Gen. Ronald Burgess, the No. 3 official in the DNI's office, will serve as acting director until a new one is confirmed, Feinstein said.
Earlier this month, President Barack Obama nominated retired Adm. Dennis Blair to be chief of intelligence.
Blair's confirmation hearing was held last week, and the Senate Intelligence Committee is expected to recommend approval as early as Wednesday, sending the nomination to the full Senate for a final vote.
McConnell had been expected to remain as DNI until Blair was in place, but the delay in Blair's confirmation prompted him to announce his resignation sooner than that.
The retired admiral will continue to advise Obama, however, having agreed to serve on the President's Foreign Intelligence Advisory Board.
The defense consulting firm Booz Allen Hamilton announced Tuesday that McConnell will return to the company as a vice president. He left the firm in February 2006 to become the nation's second director of national intelligence.
The office was created in late 2004 as part of the effort to improve intelligence gathering after the 9/11 terrorist attacks on the United States and the faulty intelligence on Iraq weapons of mass destruction.