President Barack Obama on Sunday said the US is doing everything in its power to rescue a 26-year-old woman held by the Islamic State, speaking in a wide-ranging interview also covering politics and a measles outbreak. Obama’s comments to NBC came a day after a Japanese journalist held by the militants was purportedly beheaded. Obama said he has watched videos of hostages being beheaded. “Every morning I get a presidential daily briefing, and it gives me a pretty clear sense of the terrible stuff that’s happening. And it’s part of the reason why we have to be so vigilant and so aggressive in going after a vicious organization like ISIL,” Obama said, using an acronym for the Islamic State group.