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North Korea agreed, last month, to freeze uranium enrichment and missile tests in exchange for large amounts of food aid from the United States. American officials thought they had an understanding, but then last week North Korea announced it would be launching a satellite using a long-range missile. As NPR's Mike Shuster reports from Seoul, all this is now threatening to overshadow next week's global nuclear security summit in Seoul, which President Obama is planning to attend.

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Now, even if the shooter, George Zimmerman, is arrested for the death of Trayvon Martin, a conviction could be hard to get because of the controversial law that Kathy mentioned in her report. Let's take a closer look at that law. It's called Stand Your Ground and it allows people to use deadly force to defend themselves when confronted with a threat of violence. It's been on the books in Florida for several years. And as NPR's Greg Allen reports from Miami, it was a source of controversy long before the Martin shooting.

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Let's go now to Florida, where late yesterday Governor Rick Scott announced that a new state attorney has been assigned to investigate the shooting death of Trayvon Martin. The announcement came as thousands rallied in Sanford demanding justice for Martin. The teen was shot as he walked unarmed in Sanford, a suburb of Orlando. The shooter, George Zimmerman, is a volunteer neighborhood watch captain and he claims self-defense. He's also not been arrested. As NPR's Kathy Lohr reports, the cry is growing louder for an arrest to be made.

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It's MORNING EDITION from NPR News. Good morning. I'm David Greene.

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And now, let's get down to the campaign trail. In the race for the Republican nomination, the scene has shifted to Louisiana which is holding its primary tomorrow. Today, all four of the remaining GOP candidates are campaigning in the state.

Most of the media focus is on Rick Santorum and Newt Gingrich. Both men have won other southern primaries, and both have been in and out of Louisiana all week long, hoping a victory there will keep their slim chances of winning the GOP nomination alive. Here's NPR's Brian Naylor.

Pope Benedict XVI begins a visit Friday that takes him to Mexico, a country with around 100 million Catholics, and to Cuba, a place where church leaders have played an increasingly active role in seeking change.

There are sensitive issues in both countries that the pope is likely to address in some form. In Mexico, it's the brutal drug war that has claimed roughly 50,000 lives over the past five years.

On Friday's Morning Edition, Elizabeth Blair investigates one of television's pressing questions: Why has Mad Men been off the air so long? It's returning this Sunday night with a two-hour season premiere, but it's still puzzled some viewers that it has been off for such a long time.

Thursday marked the first time President Obama has visited Oklahoma since running for the White House in 2008. He didn't win the state four years ago, and he's not expected to carry the traditionally red state this November, either.

But one Oklahoma town took center stage Thursday as Obama wrapped up a two-day tour of four states promoting his energy policy.

The Army soldier suspected of going on a shooting rampage in Afghanistan will be charged with 17 counts of murder, the AP, NBC News and Reuters are reporting.

The news organizations are pinning the report on unnamed U.S. officials.

NBC News reports Staff Sgt. Robert Bales will face six additional counts of assault and attempted murder in connection the March 11 massacre in southern Afghanistan.