(CNN) - The McCain-Rumsfeld feud continues with new jabs on both sides, fueled by the release of the former defense secretary's new book.
Quoting from Rumsfeld's upcoming book "Known and Unknown" during an interview on ABC's "Good Morning America," George Stephanopoulos asked McCain to respond to the charge that he has a "hair-triggered temper" and "a propensity to shift his positions to appeal to the media."
The 2008 Republican presidential nominee said "thank God he (Rumsfeld) was relieved of his duties and we put the surge in, otherwise we would have had a disastrous defeat in Iraq."
The two men famously clashed during former President George W. Bush's second term in office. Rumsfeld was the lead architect of the invasion into Iraq in 2003, with which McCain publicly disagreed. The senator was in favor of the war but felt more troops were needed for the incursion to be successful.
"He and I had a very, very strong difference of opinion about the strategy that he was employing in Iraq, which I predicted was doomed to failure," McCain said.