Those three plus former New York Mayor Rudy Giuliani, anti-war candidate Ron Paul and actor and former senator Fred Thompson were taking part in the debate organised by ABC.
Mr Huckabee began by defending his comments that the president had pursued an "arrogant" and "bunker-mentality" foreign policy.
He then attacked Mr Romney for not supporting Mr Bush's decision a year ago to increase US troops in Iraq.
"I supported the surge before you did," Mr Huckabee said.
Mr Romney shot back by stating that his accuser was wrong. "Don't try to mischaracterise my position," he said.
Sen McCain joined in by saying that he alone among the Republican contenders had criticised Mr Bush's initial strategy of the Iraq war.
However, he said that "we are succeeding now in Iraq" and that the president should be given credit for that.
Sen McCain and others then voiced support for the administration's overall anti-terror policies.
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