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An NPR/PBS NewsHour/Marist poll finds special counsel Robert Mueller is largely unknown to the public, which puts him in a precarious position. Alex Wong/Getty Images hide caption

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Alex Wong/Getty Images

Colin Campbell last month in his home near Los Angeles, Calif. Campbell was diagnosed with Lou Gehrig's disease — ALS — eight years ago. He gets Medicare because of his disability, but was incorrectly told by several agencies that he couldn't use it for home care. So, instead, he pays $4,000 a month for those services. Heidi de Marco/Kaiser Health News hide caption

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Heidi de Marco/Kaiser Health News

Hydrocodone-acetaminophen pills, also known as Vicodin, arranged for a photo at a pharmacy in Montpelier, Vt. A new report from the National Safety Council says the abuse of prescription opioids has helped fuel an epidemic in overdoses. Toby Talbot/AP hide caption

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Toby Talbot/AP

Demonstrators protest at Sen. Dean Heller's, R-Nev., office in support of the Deferred Action for Childhood Arrivals (DACA), and Temporary Protected Status (TPS), programs on Capitol Hill on Tuesday. Jose Luis Magana/AP hide caption

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Jose Luis Magana/AP

A man gets ready to let one loose. Not pictured: all the folks around him diving for cover. CSA-Printstock/Getty Images/iStockphoto hide caption

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CSA-Printstock/Getty Images/iStockphoto

An engineer shows a sample of biodiesel at an industrial complex in General Lagos, Santa Fe province, Argentina. The United States recently imposed duties on Argentine biodiesel, blocking it from the U.S. market. Eitan Abramovich/AFP/Getty Images hide caption

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Eitan Abramovich/AFP/Getty Images