Mr Bartlett began his career with the Bush organization during the President's first run for Texas Governor. (Bloomberg)
Bartlett becomes the latest top Bush administration official to resign recently. Others, who departed last month, include Sara Taylor, the White House political director; deputy national security adviser J.D. Crouch; Meghan O'Sullivan, also a deputy national security adviser; and Randall Tobias, head of the U.S. Agency for International Development.