Giuliani campaigned in Iowa Wednesday and responded to Judith Regan's allegation.
COUNCIL BLUFFS, Iowa (CNN) - Republican presidential candidate Rudy Giuliani said Wednesday that he "knows nothing" about former book publisher Judith Regan's claim that she was told to lie about a relationship she had with Bernard Kerik - the former New York City mayor's pick for Homeland Security secretary and former New York City police commissioner.
"I don't respond to the story at all," Giuliani said. "I don't know anything about it, and it sounds to me like kind of a gossip column story more than a real story."
Regan worked for HarperCollins Publishers, LLC, a division of parent company News Corp. She claims the company's political agenda centers on Giuliani's bid for the White House and that News Corp. asked her to lie to federal investigators about Kerik, her former lover.
When asked if he was aware of their relationship, Giuliani repeated that he thinks the story is just gossip and added, "The last thing in the world you want to do when you're running for president is respond to gossip column type stories."
Related: Watch Giuliani's comments on immigration and Judith Regan's claims
– CNN Iowa Producer Chris Welch