Ex-Giuliani official tells CNN she's appalled by what he's become: 'A different person than what we knew'
GOP strategist Susan Del Percio (Screen cap).

Susan Del Percio, a Republican political strategist who once worked for Rudy Giuliani when he was mayor of New York, told CNN on Tuesday that she is shocked and appalled by the person he's become.

Talking with CNN's Alisyn Camerota, Del Percio said she has been astonished to see Giuliani rambling during off-the-cuff TV interviews in which he has shown a total inability to tell a coherent story.

"When I went into the administration in my mid-20s, I worked for someone who was so disciplined, methodical and an inspiring leader and that's not who I see right now," she said. "The thing that is most disappointing to see is the lack of discipline."

Del Percio explained that she thought Giuliani was brought on to handle negotiations with special counsel Robert Mueller's team -- but he had somehow let himself get sidetracked into being President Donald Trump's public relations liaison for discussing the Stormy Daniels scandal.

And while Del Percio would not go so far as to speculate on whether the former New York mayor is mentally deteriorating, she did say that there's an unmistakable change in the way that he's handling himself now versus how he handled himself in the past.

"I think we see a different person than what we all knew 25 years ago," she said.

Watch the full interview below.