WASHINGTON — John McCain emphatically and persistently denied yesterday that he had any personal ties to a female lobbyist and said that no one in his campaign had advised him to avoid her.

The New York Times triggered twin political and journalistic firestorms by raising questions about the relationship between McCain, who has cultivated an image of moral rectitude and political independence, and corporate lobbyist Vicki Iseman. The story said that aides had tried to discourage the Arizona senator from dealing with Iseman eight years ago because they feared that "the relationship had become romantic."

McCain said the account was "not true." Times Executive Editor Bill Keller defended it, saying in a statement: "On the substance, we think the story stands for itself."

It was unclear yesterday what, if any, political fallout the story might cause and whether it would help or hurt McCain's quest for the presidency. Also unclear were the journalism repercussions.

Some critics faulted The Times for relying on anonymous sources, retelling old stories about McCain and raising the possibility that the senator and the lobbyist may have had a romantic relationship without providing more than hearsay. Others said the story provided legitimate information about a presidential candidate.

HUCKABEE BEGS OFF

Former Arkansas Gov. Mike Huckabee, McCain's leading rival for the GOP nomination and a Baptist minister, dismissed the paper's allegations. "I take him at his word," Huckabee said. "For me to get into it is completely immaterial."

There also was talk that conservatives who have been reluctant to embrace McCain because of his stands on immigration, torture and other issues might now rally behind him.

However, David Keene, the chairman of the American Conservative Union, said he doubted that the story would trigger a gusher of sympathy. "I don't think for most conservatives The Times dictates where they're going to end up," he said with a laugh.

The Times said that some of McCain's top advisers, fearing there might be an intimate relationship between the two, "intervened to protect the candidate from himself — instructing staff members to block the woman's access, privately warning her away and repeatedly confronting him, several people involved in the campaign said on condition of anonymity."

The story relies heavily on two unidentified former McCain "associates" but doesn't characterize their current relationships with him. A former McCain aide, John Weaver, told both The Times and The Washington Post that he met with Iseman at Washington's Union Station to persuade her to stop seeing the senator.

CORPORATE FLIGHTS

The story also reports that Iseman, whose clients include firms with substantial business before the Senate Commerce Committee, "had been turning up with (McCain) at fundraisers, visiting his offices and accompanying him on a client's corporate jet." McCain chaired the committee at various times from 1997 to 2005.

McCain yesterday almost categorically denied the story's main points.

"I've served this country honorably for half a century," the likely Republican presidential nominee said with his wife, Cindy, at his side. "At no time have I ever done anything that would betray the public trust."

American Journalism Review Editor Rem Rieder called the story "defensible" because McCain cites his independence from lobbyists as an important campaign theme. "The ethical blind spot, as well as a possible pattern, make it a story," Rieder said.

Bryce Nelson, a professor of journalism at the University of Southern California's Annenberg School for Communication, said that while the piece's structure was "strange," he thought that the news about the aides' concern "is certainly relevant."

Others found the story wanting. "The hole in this story is the innuendo they can't prove," said Philip Meyer, a professor of journalism at the University of North Carolina in Chapel Hill.