Robert Gates in The Obamians, by James Mann

On War & Peace: Clinton-Gates combo won push for Afghan surge

Robert Gates gradually came around to supporting the McChrystal request, and Hillary Clinton did, too. During that period, the two often sided with each other in administration debates; they were happy to show that the secretaries of state and defense could work smoothly together, unlike their immediate predecessors, Donald Rumsfeld with Colin Powell & Condi Rice. The Clinton-Gates combine helped to win over the president to sending more troops, despite the skepticism of other senior administration officials such as Biden; the president was not prepared to override the recommendations of the two departments primarily responsible for foreign affairs. Obama approved the deployment of 30,000 more American troops for Afghanistan, bringing the total to about 100,000, and also called on NATO allies to provide another 5,000 or more of their own.