New questions were raised today about Rudy Giuliani’s explanation for submitting police security expenses to obscure city agencies while he was mayor of New York and carried on a secret affair with his mistress, who also was given use of a police driver and city car. Giuliani said Thursday the unusual billing practice was not intended to hide anything but instead to speed payment of American Express credit card bills. But the current New York Police Commissioner Ray Kelly said today he knew of no problems with the delay of payments before Giuliani was mayor, when Kelly served under Mayor David Dinkins, or since. THE BLOTTER RECOMMENDS Blotter Giuliani’s Mistress Used N.Y. Police as Taxi Service Blotter Giuliani’s Ties to Qatar Raise Questions for Mr. 9/ll Blotter Out of Spotlight, Giuliani Embraces Convicted Moneyman Photos Giuliani and the Priest Blotter Giuliani Defends, Employs Priest Accused of Molesting Teens Video Listen to Bin Laden’s Message to EuropeGiuliani Defends Accused Priest Photos Trouble on the Campaign Trail Click Here for Full Blotter Coverage "I don’t recall anybody, any statements about delay," Kelly told reporters. He said all bills for the police details for Dinkins and now for Mayor Mike Bloomberg are handled directly "through the police department." Critics say Giuliani’s practice of sending the bills to other agencies suggested he was trying to hide his extra-marital affair with Judith Nathan, who he later married after divorcing his second wife, Donna Hanover. In South Carolina today, Giuliani declined to offer any further explanation, saying, "We’ve already explained it." Giuliani’s staff made "a concerted effort" to keep reporters from coming near to the candidate, according to ABC News reporter Jan Simmonds. "At least three Giuliani press staffers loudly instructed the press to stay within their cordoned-off area and were warned not to approach the candidate," Simmonds reports. This post has been updated. Do you have a tip for Brian Ross and the Investigative Team?