Republican presidential frontrunner Rudy Giuliani took a swing at Sen. Hillary Clinton Sunday, saying talk of her plan to send emissaries to other countries immediately upon her White House election is presumptuous and interferes with current foreign policy.

"I think it's important that we conduct this debate in a way that we don't interfere with the ability of the country to function in a proper way between now and (when the next president takes office)," Giuliani said at a town hall meeting in New Hampshire.

"Hillary is not a president-elect last time I checked. Hillary is not even the nominee of the party. So, this is very very premature to be talking about sending ambassadors all around the world, even before she becomes president," he said.

Giuliani called on Clinton to retract her comments, basing his criticism in part on an article in Sunday's Des Moines Register that quotes constitutional scholars critical of the Democratic frontrunner's remarks.

Click here to read the Des Moines Register article.

Clinton recently told a group of Iowa voters that she will not even wait until she is inaugurated to begin her first foreign policy initiative.

"The day after I'm elected, I'm going to be asking distinguished Americans of both political parties to travel around the world on my behalf with a very simple message to the governments and the people alike: The era of cowboy diplomacy is over," she said, using an oft-repeated phrase aimed at President Bush and frequently winning her loud applause.

Clinton's New Hampshire spokeswoman Kathleen Strand dismissed Giuliani's remarks.

"Senator Clinton and Mr. Giuliani have a fundamental disagreement. She will end the war in Iraq, reverse the Bush-era cowboy diplomacy and restore America's standing around the world. Mr. Giuliani wants to escalate the war in Iraq and supports President Bush's failed foreign policy approach," she said.

But Giuliani called Clinton's comments on the trail the mistake, and suggestesd she retract her statement before she causes damage.

Bush "is going to be the president of the United States from now until the time that a new president takes over. Until then, that is the only one conducting the foreign policy of this country," he said. "I think it would be good for the country if ... Senator Clinton would correct that statement now."

FOX News' Aaron Bruns contributed to this report.