A spokeswoman forsays it is unfortunate a supporter throwing a party for the candidate aims to raise $9.11 per person for the campaign.
Abraham Sofaer is having a fundraiser at his Palo Alto, Calif., home on Wednesday, when Giuliani backers across the country are participating in the campaign's national house party night.
But Sofaer said he had nothing to do with the "$9.11 for Rudy" theme.
"There are some young people who came up with it," Sofaer said when reached by telephone Monday evening. He referred other questions to Giuliani's campaign.
"I'm just providing support for him. He's an old friend of mine," Sofaer said of Giuliani.
Sofaer was a State Department adviser under President Reagan and is a fellow at Stanford University's Hoover Institution. Federal election data indicates Sofaer has given nearly $50,000 to Republican causes and candidates, including Giuliani, since 1995.
Giuliani spokeswoman Maria Comella said: "These are two volunteers who acted independently of and without the knowledge of the campaign. Their decision to ask individuals for that amount was an unfortunate choice."
According to the invitation, "$9.11 for Rudy" is an "independent, non-denominational grass-roots campaign to raise $10,000 in small increments to show how many individual, everyday Americans support 'America's Mayor.'"
Giuliani was mayor of New York during the Sept. 11 terrorist attacks.
Democratic presidential candidate Chris Dodd's campaign said on Tuesday the fundraiser exploits the Sept. 11 terrorist attacks for political purposes.
Dodd called on Giuliani to refuse the money raised at the event, saying the theme "is absolutely unconscionable, shameless and sickening." A Giuliani spokeswoman said the $9.11 idea was selected without the campaign's knowledge.