Former Defense Secretary Robert Gates sat down with Sean Hannity tonight to discuss his scathing revelations about the Obama administration from his book, “Duty: Memoirs of a Secretary at War.”

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In it, Gates writes that President Obama did not believe in the U.S. strategy in Afghanistan.

Tonight, Gates told Hannity that the president’s decision to go ahead with the surge was courageous. “Behind the scenes he was continually worried that the thing wasn’t working and expressed those concerns.”

Hannity responded, “If I’m a parent and that’s my kid, and the Defense Secretary’s telling me [the president] sent them in a war that he’s convinced is going to fail, what are they thinking?”

Gates said he hopes families of our soldiers will see that President Obama stuck to the decisions he made. “I think that the key is to focus on the actions here, and the fact that he sustained this effort despite his reservations. And frankly, that’s one of the reasons why I was comfortable continuing to work for him.”

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He wrote in the book that Hillary Clinton told the president that her opposition to the surge had been political because she was facing Obama in an Iowa primary. That struck Gates, he told Hannity, because she strongly supported the surge. “When she was Secretary of State, I never hear anything like that.”

Gates recalled how the administration would bash George W. Bush’s team – which he was a part of – in front of him. He detailed the differences of how Bush and Obama dealt with military officials. With President Obama, Gates said he was always respectful but, “I always had the feeling with him, first of all, that he was suspicious of their motives. And second, that time spent with them was an obligation.”

In part three of the Hannity interview, Gates addresses Vice President Joe Biden’s council to the president and his relationship with the military. He also doesn’t hold back when it comes to Congress, blasting members on both sides of the aisle for putting elections and their own ambitions over country. 

Part 2:

WATCH: Obama Responds to Gates' Book

Part 3:

Real 'Lone Survivor' on Gates' Book: 'Tough' to Fight Without Clear Objective