Rick Santorum, Jon Huntsman and Gary Johnson have condemned the booing of a gay soldier during Thursday night's GOP presidential debate.

The three presidential hopefuls shared the stage during the televised Fox News/Google debate, where none of the candidates spoke out when a gay soldier serving in Iraq was booed by the audience.

Referring to the recent repeal of “Don't Ask, Don't Tell,” Stephen Hill, dressed in an Army t-shirt, asked via a YouTube clip: “Do you intend to circumvent the progress that has been made for gay and lesbian soldiers in the military?”

The audience cheered when Rick Santorum called DADT repeal a “tragic social experiment” and vowed to reinstate the policy, if elected president.

Santorum addressed the booing during a Fox News segment.

“I condemn the people who booed that soldier. That soldier is serving our country. I thank him for our service to our country. I'm sure he's doing an excellent job,” Santorum said. “I have to admit I seriously did not hear those boos. Had I heard them, I certainly would have commented on them.”

“Had I, I would have said, 'Don't do that. This man is serving our country. And we are to thank him for his service.'”

Johnson, the former governor of New Mexico, told MSNBC: “If I have one regret from last evening, it's that I didn't stand up and say, you know, you're booing a U.S. serviceman who is denied being able to express his sexual preference. There's something very wrong with that.”

And in comments to TalkingPointsMemo.com, Huntsman, the former governor of Utah, agreed.

“It was unfortunate,” Huntsman said. “You know, we're all Americans and the fact that he is an American who put on the uniform says something good about him. In my opinion, when you have booing this is not indicative of Republicans. This is not the Republican Party that I belong to.”

(Related: Obama says GOP booing of gay soldier “not who we are.”)