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.