The eight GOP presidential hopefuls squared off once again in last night's CNN National Security Debate.

The candidates tackled questions on tough foreign policy issues confronting the United States, including the war in Afghanistan, aid to Pakistan and cuts in defense spending. This was the 11th major showdown between the Republican candidates, and the first in which Newt Gingirch came in as the frontrunner.

Alina Cho talks with Larry Arnn and Caroline Elliot, two undecided voters who attended the debate to see if last night helped them clarify their choice for the GOP nomination.

GOP presidential debate number 11 has come and gone. The CNN National Security Debate last night was held just steps from the White House, and each candidate argued that they could be doing a better job than President Obama.

So who stood out? Who stumbled? And will this moment prove to be a game changer? Carol Costello speaks with Republican Strategist Karen Hanerty and CNN contributor David Frum to get their take.

Former Utah Governor and 2012 GOP presidential candidate Jon Huntsman is trailing badly in the latest polls. But he has some credentials his fellow GOP competitors can't match. 

Huntsman has significant foreign policy experience; he once worked in the Obama administration as the U.S. ambassador to China.  And he had the chance to show off his foreign policy chops in last night's CNN national security debate.

Today on American Morning, Jon Huntsman talked with Carol Costello about why GOP primary voters are giving him a second look and why he believes a failure to win in New Hampshire "is not an option." He also addressed questions about whether his father contributed any money to a superpac for campaign ads in New Hampshire.

Congresswoman Michelle Bachmann is fresh off a meeting with Donald Trump – and fired up about participating in tonight's CNN national security debate.

She's way behind in the latest polls, but she still believes she can pull off an upset in the Iowa Caucuses. Bachmann also has a new book out, titled Core of Conviction: My Story, in which she documents how she was "called to serve" in the highest office.

Today on American Morning, Carol Costello sat down with Bachmann to talk about why she believes she's "the most consistent candidate" – and why she thinks its time to put a mother in the White House.

The Republican presidential candidates face off once again Tuesday night in the CNN National Security Debate. CNN is teaming up with leading Republican-leaning think tanks Heritage Foundation and American Enterprise Institute to host a debate that focuses heavily on foreign policy issues. The debate will also address top economic concerns, including the failure of the Congressional super committee to find agreement to cut $1.2 trillion from the country's long-term debt. The debate is the 11th major showdown between the Republican candidates.

The Heritage Foundation's James Carafano and the American Enterprise Institute's Marc Thiessen tell Carol Costello that tonight's debate will show voters who really is commander-in-chief material.

For the first time tonight, Newt Gingrich will take the debate stage at the top of the 2012 GOP presidential pack. A new CNN-ORC has the former house speaker capturing 24% of the vote. Former Massachusetts Governor Mitt Romney trails in second place with 20%.

This morning on American Morning, Alina Cho talks with Ron Brownstein about how Gingrich's frontrunner status will play out in tonight's CNN debate.