On Monday’s NewsHour…

GULF OIL SPILL UPDATE | BP officials said the company has captured about a fifth of the oil leaking into the Gulf of Mexico, but scientists have voiced new worries about the environmental implications of the spill. Gwen Ifill talks to Jane Lubchenco, head of the National Oceanic and Atmospheric Administration for more.

SUPREME COURT: LIMITS ON JUVENILE SENTENCES | The Supreme Court has struck down laws in multiple states that allow juveniles to be sentenced to life terms with no chance of parole for crimes that do not involve murder. Ray Suarez talks to Marcia Coyle of the National Law Journal about that and other rulings issued Monday.

KENTUCKY PRIMARY ELECTIONS | Voters on both sides of the aisle are preparing to cast ballots in Kentucky’s two Senate primary contests. Jim Lehrer talks to reporter Joseph Gerth of the Louisville Courier-Journal for a look ahead at Tuesday’s election.

IRAN-TURKEY FORGE NUCLEAR FUEL SWAP DEAL | Iran plans to ship more than 2,600 pounds of low-enriched uranium to Turkey in exchange for uranium fuel rods to use in a research reactor, as part of a fuel swap deal brokered by Brazil and Turkey. Judy Woodruff talks to Henry Sokolski, executive director of the Nonproliferation Policy Education Center, and Cliff Kupchan, research director at the Eurasia Group, about the agreement and where it leaves the possibility of sanctions.

Monday’s anchors are Jim Lehrer and Gwen Ifill. Hari Sreenivasan will have the day’s other top news stories and a look at Web features, including a collection of images from the anti-government protests in Thailand, background reports on Tuesday’s primary races in Pennsylvania and Arkansas, and a NewsHour Extra report by students in Austin, Texas about how the U.S. compares to other countries on juvenile sentencing.

We hope you will join us.