Upcoming legislation on guns and immigration, plus more on North Korea

I think it is a very important message that North Korea simply has to understand this will not go unanswered if they take any kind of action, especially against South Korea. Remember a few years back they sank a South Korean ship, cost a number of lives, and the South Korean government essentially didn't respond and the government all but fell. I guarantee if something happens this time, it will not go unanswered by the South Koreans or the United States.

To step back though, I really don't think anyone thinks North Korea, for all its threats and bluster, is going to deliberately start a war. But Sen. John McCain, R-Ariz., reminded me last week on the show that wars have started before by accident. And that's, I think, what has people most worried -- the possibility that this young man who's leading North Korea is going to blunder something or slip up and all of a sudden it will be war. If they do something accidentally that warrants a war, one will start.

We're going to talk about this a bit on Sunday, but we're also going to get into the battles going on in the U.S. Senate. This week gun control jumped a big hurdle when a group of a few senators came to a compromise on background checks. Sen. Pat Toomey, R-Penn., and Sen. Joe Manchin, D-W.V., announced Wednesday they'd struck a deal on an amendment that would close the so-called gun show loophole while also helping to secure some Second Amendment Rights. The National Rifle Association immediately came out against it, saying they "unequivocally" disagreed with it and threatening to score lawmakers according to their votes on it.

We're going to have Senators Manchin and Toomey on the show Sunday. Do they think they've got the bipartisan support to pass the gun control legislation, with this amendment included? What have their conversations with House Republicans sounded like?

A reporter asked Sen. Toomey if he was worried about risking his A-ranking from the NRA. He told that reporter at a news conference, "What matters to me is doing the right thing, and I think that this is the right thing, and I think most Pennsylvanians will agree that making it more difficult for criminals and the mentally ill to obtain guns is the right thing to do." Will he be able to stick by that despite what appears to be a coming onslaught of criticism and backlash?

We'll also ask Mark Kelly, the husband of former Rep. Gabby Giffords, R-Ariz., who was shot in the head in 2011 about all of this. The duo has formed a group pushing for common sense gun control. What's their sense of this compromise? Is it enough?

We'll also look at another bipartisan deal that sounds like it's coming along, the one on comprehensive immigration reform. While the so called gang of eight hasn't announced a bill this week, as Sen. Chuck Schumer, D-N.Y., told me he hoped to on last Sunday's show, their aides tell CBS News a deal is still close and they're still hopeful. I'll ask Sen. Marco Rubio, R-Fla., a member of that group, what we should be looking for and when we should expect a bill. What's the hangup been this week?

Then I'll turn to some very smart people to help me sum up all of these issues -- foreign and domestic. The Washington Post's David Ignatius and The New York Times' David Sanger will help me look at the North Korean threat. Then Cook Political Report's Amy Walter and CBS News Political Director John Dickerson will dive into these legislative issues.

It's a lot, but it always is -- that's why it's "Face the Nation." Check your local listings and tune in on Sunday morning.