If you are a prominent Republican Presidential candidate at the moment, Jon Huntsman made sure to target you on Sunday morning.

The former US ambassador to China appeared on ABC’s This Week and strongly criticized his rivals in the race for the GOP nomination, centering most of his attack on Mitt Romney, Rick Perry, and Michele Bachmann.

Huntsman pointed out the various flip flopping of the ex-Massachusetts governor when guest host Jake Tapper mentioned Romney’s change on the idea of a flat tax. “If we were to talk about his inconsistencies and the changes in various issues, we’ll be here all afternoon,” he said.

When Tapper asked Huntsman his thoughts on Perry’s continued skepticism on climate change, the one time Utah governor again did not refuse to throw a few verbal jabs.

“The minute the Republican party becomes the anti-science party, we have a huge problem,” he said. “When we take a position that isn’t willing to embrace evolution, when we take a position that basically runs counter to what 98 out of 100 climate scientists from what the National Academy of Scientists said on what is causing climate change, and man’s contribution to it, I think we find ourselves on the wrong side of science and in a losing position.”

Huntsman wasn’t finished on Perry, as he also commented on the Texas governor’s controversial statements about FED chairman Ben Bernanke earlier in the week. “I don’t know if that’s pre-secession Texas or post secession Texas,” he said.

And after giving his perspective on the leading male candidates for the GOP nomination, Huntsman than gave his thoughts on Rep. Bachmann’s promise that gas would be $2 if she became President. “We live in the real world, grounded in reality, and gas prices just aren’t going to rebound like that,” he said. “It’s completely unrealistic.”

Asked by Tapper whether he could trust Bachmann as President, Huntsman bluntly stated, “I wouldn’t necessarily trust any of my Republican opponents on a recent debate stage with me when every single one of them would have allowed this country to default.”

WATCH: Video from ABC, which aired on August 20, 2011.