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The U.S. Supreme Court has ruled that a longtime legal resident of the United States was improperly deported for possession of a small amount of marijuana. By a 7-2 vote, the justices said that it defies common sense to treat an offense like this as an "aggravated felony" justifying mandatory deportation.

As Congress continues its debate over immigration reform, nearly a half-million young people who are in the U.S. illegally have already applied for deferred action.

The Obama administration started the policy, formally known as Deferred Action for Childhood Arrivals, last year for people who were brought into the U.S. illegally as children. Those who are approved gain the right to work or study and avoid deportation for two years.

As investigators look into the Boston Marathon bombings, one crucial question is whether the suspects, brothers Tamerlan and Dzhokhar Tsarnaev, acted alone or had help. The clues might be found in the bombs used.

From what is now known, it appears the brothers assembled a whole arsenal of explosives. Watertown Police Chief Edward Deveau told CNN last weekend that the suspects had at least six bombs, including the two used in the attack and one thrown at police during a shootout.

More online retailers would have to collect sales tax under a bill making its way through the U.S. Senate this week. The measure won strong bipartisan backing on a procedural vote Monday, and President Obama has said he would sign it.

The political battle over the bill pits online retailers against brick-and-mortar stores — and, in some cases, against other online sellers.

Transcript

JENNIFER LUDDEN, HOST:

This is TALK OF THE NATION. I'm Jennifer Ludden in Washington. Neal Conan is away. Accusations that the Syrian government has repeatedly used chemical weapons against its own people are piling up. First were British and French officials who say they have credible evidence. Today, an Israeli military official joined the chorus.

The U.S. says it's evaluating the allegations. The stakes are high. Last year the Obama administration said the use of chemical weapons would be a game-changer that could provoke a stronger U.S. response.