Rove sharply criticized Clinton Wednesday.
WASHINGTON (CNN) – He may plan to take a break from presidential politics, but soon-to-be ex-White House aide Karl Rove isn't holding back when it comes to his critique of Democratic presidential hopeful Hillary Clinton.
On conservative talk-radio host Rush Limbaugh's show Wednesday, Rove predicted the New York Democrat would win her party's nomination but said she was "fatally flawed" and would ultimately lose the race for the White House.
"There is no frontrunner who has entered the primary season with negatives as high as she has in the history of modern polling," said Rove, who announced Tuesday he was resigning his White House post. (Listen to Rove's comments on Bush, Clinton)
"She is going into the general election, depending on what poll you look at, with high forties on the negative side and just below that on the positive side. There is nobody who has ever won the presidency who has started out in that position," the man also known as "Bush's brain" added. (Related: Clinton happy to give Rove 'heartburn')
Rove also fired back at Clinton's recent campaign ad in which the former First Lady states, "If you're a family that is struggling and you don't have health care, you are invisible to this president."
"I am a little surprised she jumped out there and made such an accusation when she has a record so spotty and poor on health care issues," he said.
Phil Singer, a Clinton spokesman, brushed aside Rove's critique of her favorability numbers, saying, "It sounds like Karl Rove is writing Sen. Obama's talking points."
"The reality is that as the campaign now gets under way, Sen. Clinton's ratings are improving because Americans are seeing that she has the strength and experience to deliver change," he added.
TIME.com: Rove's final retreat
– CNN Ticker Producer Alexander Mooney