On Monday’s NewsHour…

GULF OIL LEAK UPDATE | Federal officials said the amount of oil escaping into the Gulf of Mexico is beginning to slow as it’s being captured, but the cleanup and restoration will likely span years. Gwen Ifill talks to Ralph Portier, professor of environmental science at Louisiana State University, and Aaron Viles, campaign director of the Gulf Restoration Network about efforts to mitigate the damage.

RISE OF HOMEGROWN TERRORISM | Two New Jersey men were arrested over the weekend for possible connections to a terrorist group operating in Somalia. Jeffrey Brown examines the rise of homegrown terrorism with professors Jessica Stern of Harvard University and Fathali Moghaddam of Georgetown University.

ADVANCES IN CANCER RESEARCH | Researchers reported new progress in the treatment of breast, skin, lung and ovarian cancers at a meeting of top cancer experts in Chicago over the weekend. Ray Suarez talks to American Society of Clinical Oncology President George Sledge for an update.

HOUSING KENYA’S POOREST | Correspondent Fred de Sam Lazaro reports from Kenya on new efforts to help poor residents of Nairobi’s crowded, unsanitary slums find adequate housing through entrepreneurship and microfinancing.

PRIMARY ELECTION PREVIEW | Voters across the country prepare to cast ballots in this year’s biggest day of primaries, as 10 states host contests on Tuesday. Judy Woodruff talks with Amy Walter of Hotline and Dan Balzof The Washington Post for a preview of the races to watch.

Monday’s anchors are Jeffrey Brown and Gwen Ifill. Kwame Holman will have the day’s other top news stories and a look at Web features, including our updated oil ticker with the latest estimates of the spill, a follow-up to Ray Suarez’s report on China’s obesity crisis and a look ahead at the World Cup soccer tournament in South Africa.

We hope you’ll join us.