Immigration is near the top of the list of issues Americans find "the most worrying," according to a new poll conducted for NPR by the research firm Ipsos.

But Americans' views on immigration diverge sharply depending on party affiliation, where in the country we live, and whether we know people who were born outside the United States.

Barack Obama celebrates the life and legacy of Nelson Mandela in Johannesburg Tuesday, marking the centennial of the South African leader's birth. It's one of Obama's most high-profile appearances since leaving the White House 18 months ago, and a preview of what could be an active campaign schedule for the former president before the midterm elections this fall.

To an outsider, the fancy booths at a June health insurance industry gathering in San Diego, Calif., aren't very compelling: a handful of companies pitching "lifestyle" data and salespeople touting jargony phrases like "social determinants of health."

But dig deeper and the implications of what they're selling might give many patients pause: A future in which everything you do — the things you buy, the food you eat, the time you spend watching TV — may help determine how much you pay for health insurance.

New charges against a woman who tried to build bridges between the Russian government and American political leaders via the National Rifle Association delivered a breakthrough in understanding one aspect of the attack on the 2016 election: "infiltration."

After months of questions and speculation as to how or whether the NRA connection might have worked, prosecutors have proffered an answer: the Russian woman, Maria Butina, was the intermediary between Russian government officials and Americans, both in the NRA and elsewhere in politics, according to court documents.

Given the attitude with which President Trump has greeted all news of the Russian interference in the 2016 election, his performance in Helsinki on Monday should have come as no surprise.

And yet there was surprise — even shock — when the president of the United States stood on stage alongside Russian President Vladimir Putin and accepted the former KGB officer's denials regarding that interference.

As the midterm elections get more heated, passionate grassroots donors are opening their wallets to Democrats campaigning against President Trump and the GOP in their quest to take the House.

A basketball-sized lava bomb slammed through the roof of a tour boat near an active fissure of Hawaii's Kilauea volcano early Monday morning, showering the vessel with debris and injuring 23 people, according the Hawaii County Civil Defense Agency.

Officials described the incident on Facebook writing that an explosion off the coast of Kapoho hurled several lava bombs onto the boat — called Hotspot — at about 6 a.m. local time.