(CNN) - For a second straight day, Jon Huntsman is going after his rivals for the Republican presidential nomination.
In an interview to run Monday and Tuesday at 9 p.m. ET on CNN's "Piers Morgan Tonight," the former Utah governor and former U.S. ambassador to China criticized Texas Gov. Rick Perry and former Massachusetts Gov. Mitt Romney, two of the leading candidates at this stage of the race in the battle for the GOP nomination. And he also entertained serving as a running mate to Rep. Michele Bachmann of Minnesota, should she win the Republican nomination.
Reacting to Perry's controversial comment last week that he would consider "treasonous" any moves by Fed Chairman Ben Bernanke to print more money between now and next year's election, Huntsman told CNN's Piers Morgan that "I don't think - you can call the head of the Fed treasonous and expect to be taken seriously. I don't think people who are going to vote for a president are going to hear that sound bite and say that represents serious thinking on the part of the presidential candidate."
Huntsman, who taped the interview with Morgan on Friday, added that "you can fault the Fed, you know, they've only got so many tools with which - with which to draw their policy options. But treasonous, I think, is a little bit beyond."
Huntsman doesn't believe that Romney, a fellow Mormon, is the right person to take on President Barack Obama in next year's general election.
The former Utah governor said he thinks Romney's a good man who has a terrific family "but when it comes to going up against Barack Obama in an election cycle that is going to be 100 percent about expanding the economy and creating jobs, being number 47 as job creator ain't going to cut it. We were number one in job creation. I think that works."
Huntsman also criticized Romney for the Massachusetts health care plan that Romney signed into law five years ago when he was the state's governor, a plan than many people say was the inspiration for national health care law that last year passed by a Democratic Congress and signed into law by President Obama.
"Creating Obamacare before Obama, the most despised and reviled health care legislation in the history of this country, doesn't cut it, and I think that will be terribly problematic," said Huntsman.
The comments come one day after Huntsman said on ABC's "This Week" that the rest of the GOP presidential field had "zero substance."
As for his campaign for the nomination, Huntsman, who is registering low in the national polls and in surveys in the key early voting states, says that "I think we're right on the issues, and I think we're at the center right of the political scale, which is exactly where this country is."
Asked by Morgan if he'd be willing to serve as Mitt Romney's running mate, should Romney win the nomination, Huntsman said "There would be too many jokes about that. No, I can't imagine it at all."
But he didn't close the door to possibly serving as running mate to Bachmann, saying "if you love this country, you serve this country. Every time I've been asked to serve over different administrations, from Reagan to the two Bushes, to President Obama, I have the same, the same answer, and that is if you love this country, you serve her. And so, you know, if you're in a position to better the country, to bring whatever background you have to bear, whatever experiences to use in fine-tuning our future, I'll be the first person to sign up, absolutely."
But Huntsman seemed to downplay his answer, adding that "this is a hypothetical conversation. And I give you more or less a hypothetical answer."