Republican strategist Karl Rove stunned Fox News panelists on Sunday when he refused to stop suggesting that Hillary Clinton had a "brain injury" even after his own party had shunned him for the personal attack.

On Fox News Sunday, Fox News contributor Juan Williams asked Rove if he was actually helping Hillary Clinton with his recent remarks that generated headlines insinuating that she was too "brain damaged" to run for president.

"I'm not the person who said brain damage!" Rove insisted. "A concussion is by definition a traumatic brain injury."

"Karl! Come one!" Fox News contributor Kirsten Power claimed.

"So is a blood clot in the brain," Rove added. "My point is this, she's a human being. You would not be human, and not have a serious brain injury -- like this was -- and take it into consideration if you're thinking about going and doing what she might do."

"This was concern for her?" Fox New host Chris Wallace asked.

"Yeah," Rove replied. "Concern as one human being to another, but I'm more concerned about people who say, 'You know, she's in, this is a done deal.' I'm not so certain. My brain says she's running, my gut says this is going to be far more serious."

Watch this video from Fox News' Fox News Sunday, broadcast May 18, 2014.