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Former Army Gen. David Petraeus , who has traditionally stayed away from political endorsements, appears to be eager to support a Hillary Clinton candidacy, a new book alleges.

'She'd make a tremendous President,' the former commander and CIA director reportedly says in the new book ' HRC: State Secrets and the Rebirth of Hillary Clinton,' by Jonathan Allen and Amie Parnes.

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'Like a lot of great leaders, her most impressive qualities were most visible during tough times,' Petraeus adds.

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

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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.