What top national security issues should Republican candidates address?

CBS News senior national security analyst Juan Zarate says the drawdown of troops in Iraq and Afghanistan is going to a top issue at Saturday's Republican debate in South Carolina, sponsored by CBS News and National Journal.

"How do these contenders suggest that the US can actually poster itself as we begin this drawdown, currently in Iraq ending in 2011 and then Afghanistan looking at 2014?" Zarate asked.

Watch Zarate's full discussion with CBS News national security correspondent Bob Orr to the left.

If you have your own questions on national security and foreign policy for the candidates, we invite you submit your question here and they could be used in the debate.

CBSNews.com's "Hotsheet Live" will be previewing the CBS News/National Journal debate all week, including reports from the debate site in South Carolina and on the campaign trail.