" Mubarak had been a resolute ally, key to peace with Israel and to the 1991 Gulf War coalition (praised by George H. W. Bush as “my wise friend”), and then in the campaign against Al Qaeda. Barack Obama’s senior advisers—Secretary of State Hillary Clinton, Defense Secretary Robert Gates, and Vice President Joe Biden—urged caution in joining the rush to push Mubarak out. Gates was on the National Security Council in 1979 when, in his view, the United States had pulled the rug out from under the shah, with the expectation that a democratic revolution would follow. The result instead was the rise of the Ayatollah Khomeini, U.S. diplomats held hostage for 444 days, and the implacably hostile Islamic Republic. "

― Daniel Yergin , The New Map: Energy, Climate, and the Clash of Nations