CRAWFORD, Texas – A former Republican senator and presidential candidate, Bob Dole, suggested yesterday that John Kerry apologize for past testimony before Congress about alleged atrocities during the Vietnam War and joined critics of the Democratic presidential candidate who say he received an early exit from combat for “superficial wounds.” Mr. Dole also called on Mr. Kerry to release all the records of his service in Vietnam.

Separately, President Bush’s re-election campaign continued to deny links to Swift Boat Veterans for Truth, an anti-Kerry group running ads in three states, after the resignation of a campaign volunteer who appeared in the group’s new ad.

With Mr. Kerry taking a break from campaigning, running-mate John Edwards said Mr. Bush needs to tell the group to pull its ads, a step the White House and the Bush campaign refuse to take. The White House and Mr. Bush’s campaign note that Mr. Kerry has benefited from more than $62 million worth of similar advertising against the president.

“This is the moment of truth for President Bush,” Mr. Edwards said in North Carolina. “The American people have to hear directly that these ads need to come off the air.” Mr. Kerry also fought back in another new ad.

Mr. Dole told CNN’s “Late Edition” that he warned Mr. Kerry months ago about going “too far” and that the Democrat may have himself to blame for the current situation, in which polls show him losing support among veterans.

“One day he’s saying that we were shooting civilians, cutting off their ears, cutting off their heads, throwing away his medals or his ribbons,” Mr. Dole said. “The next day he’s standing there, ‘I want to be president because I’m a Vietnam veteran.'”

“Maybe he should apologize to all the other 2.5 million veterans who served. He wasn’t the only one in Vietnam,” said Mr. Dole, whose World War II wounds left him without the use of his right arm.

Mr. Dole added: “And here’s, you know, a good guy, a good friend. I respect his record. But three Purple Hearts and never bled that I know of. I mean, they’re all superficial wounds. Three Purple Hearts and you’re out.”

Mr. Kerry’s supporters rose to his defense.

“Senator Kerry carries shrapnel in his thigh as distinct from President Bush, who carries two fillings in his teeth from his service in the Alabama National Guard, which seems to be his only time that he showed up,” former chief of staff in the Clinton White House, John Podesta, said on ABC’s “This Week.”

Mr. Bush served stateside in the Guard during the Vietnam years. Mr. Podesta’s reference was to the White House’s release of documents earlier this year showing Mr. Bush’s dental visits during his Guard years after questions arose about whether he had always reported for duty.

The Bush-Cheney campaign manager, Ken Mehlman, also blamed Mr. Kerry for the ongoing debate, complaining on NBC’s “Meet the Press” that “Kerry himself has attacked the president for his service during the Vietnam years,” while the Republican’s campaign has “so strongly praised” Mr. Kerry’s tour of duty in Vietnam.

The Bush campaign also said the Federal Election Commission should immediately dismiss what it termed a “frivolous” complaint by Mr. Kerry’s campaign alleging coordination between the re-election effort and the Swift Boat group.

The White House and the Bush campaign for weeks have denied any connection to the Swift Boat organization, whose early financial support came largely from a prominent Texas businessman with longtime ties to the state’s top Republicans, including Mr. Bush.

The group’s latest ad includes a Bush-Cheney volunteer, retired Air Force Colonel Ken Cordier, condemning Mr. Kerry’s 1971 congressional testimony that Mr. Dole spoke of. Mr. Cordier was a prisoner of war during Vietnam.

“Colonel Cordier did not inform the campaign of his involvement in the advertisement,” a Bush campaign statement said. “Because of his involvement Colonel Cordier will no longer participate as a volunteer for Bush-Cheney ’04.”

A new Kerry TV ad urged the president to “denounce the smear” and “get back to the issues because America deserves better.” The 30-second commercial, to air in the same three states as the Swift Boat group ad – Ohio, West Virginia, and Wisconsin – compares Mr. Kerry’s situation to the 2000 primary campaign when “Bush smeared John McCain.”

Mr. McCain has condemned the ads and called on the president to do so, too.

In response, Mr. Bush’s campaign re leased a copy of a letter it was sending to television station managers today defending itself from the claims in the new Kerry ad.

Questions mounted over the motives of Mr. Kerry’s critics, two of whom had praised his service in 1996, even as Mr. Kerry’s supporters faced questions about the candidate. Among the allegations is that Mr. Kerry lied about being in neutral Cambodia on Christmas Eve 1968.

“I don’t think anyone knows for sure whether or not they were in Cambodia that night, but they were near Cambodia on Christmas Eve,” John Hurley, who heads a pro-Kerry veterans group, said on “Fox News Sunday.” “He was five miles into Cambodia on a different occasion.”

Another allegation is that Mr. Kerry was not under enemy fire as after-action reports say he was, an incident for which he received a Bronze Star, one of five medals earned in Vietnam.

“The after-action reports were written from Kerry’s spot reports from that day,” said a Kerry critic, Van Odell, also appearing on the same program. “None of us knew he even got the Bronze Star until more recently.”