Book: Petraeus Thinks Hillary Clinton Would Make Good President

Reportedly bonded when she was Secretary of State

The comments mark an interesting departure for Petraeus, who, when it comes to politics, has typically remained quiet.

The book, to be released Tuesday, alleges that the unlikely pair forged a friendship while Clinton was Secretary of State.

According to excerpts of "HRC," obtained by ABC News, Clinton, soon after taking office, invited Petraeus to her Washington home to drink wine and discuss Middle East issues. The night was so enjoyable that she invited him over again the next night to continue their chat.