"I could have arrested Karl Rove on any given day," she said. "I'm not kidding. There's a prison here in the Capitol." 

But she said the process wouldn't "serve our country" and so "that's why I didn't arrest Karl Rove when I had the chance." 

A House committee actually did vote, in 2008, to hold Rove in contempt for not responding to subpoenas for information on U.S. attorney firings. That vote never reached the floor -- the Holder contempt vote hasn't yet reached the floor, either. 

But Rove told Fox News that Pelosi never had the power to arrest because the contempt vote was contained to the committee level. 

"She's absolutely dead wrong," said Rove, also a Fox News contributor. 

"The only way I could have been arrested is if the House had adopted the resolution, which it did not," he said. "So it's nice to know that Speaker Pelosi wanted to have me arrested.