Environment

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Sen. Marco Rubio placed third in Iowa and struggled to a fifth-place showing in New Hampshire. With South Carolina's primary Saturday, Mr. Rubio is trying to overcome nagging immigration questions once again. (Associated Press)

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Republican presidential candidate Sen. Marco Rubio campaigns with South Carolina Gov. Nikki Haley and Sen. Tim Scott. Voters say they like everything else Mr. Rubio has to say but can't get beyond his record on supporting citizenship rights for illegals. (Associated Press)

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Surrounded by soldiers, a government health agent uses larvicide to kill Aedes aegypti mosquitos that spreads the Zika virus in the Tijuca neighborhood of Rio de Janeiro, Brazil, Monday, Feb. 15, 2016. The Aedes aegypti mosquito lives largely inside homes and can lay eggs in even a bottle-cap's worth of stagnant water. The dishes beneath potted plants are a favorite spot, as are abandoned tires, bird feeders and even the little puddles of rainwater that collect in the folds of plastic tarps. (AP Photo/Silvia Izquierdo)

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This image with notations provided by ImageSat International N.V., Wednesday, Feb. 17, 2016, shows satellite images of Woody Island, the largest of the Paracel Islands, in the South China Sea. A U.S. official confirmed that China has placed a surface-to-air missile system on Woody Island in the Paracel chain, but it is unclear whether this is a short-term deployment or something intended to be more long-lasting. (ImageSat International N.V. via AP) MANDATORY CREDIT, NO SALES

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Secretary of State John F. Kerry lashed out at China after reports were confirmed that Beijing had deployed surface-to-air missiles on Woody Island in the South China Sea. (ImageSat International N.V. VIA ASSOCIATED PRESS)

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South Carolina Gov. Nikki Haley endorsed Sen. Marco Rubio's presidential bid Wednesday evening. (Associated Press)

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Threat of Declaring CO2 a Pollutant Illustration by Greg Groesch/The Washington Times

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Illustration on the power of the Supreme Court to damage American society by William Brown/Tribune Content Agency

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Sen. Lisa Murkowski, R-Alaska, gives her annual address to Alaska lawmakers on Wednesday, Feb. 17, 2016, in Juneau, Alaska. (AP Photo/Rashah McChesney) ** FILE **

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Ice from Mendenhall Glacier spills alongside sediment and rocks in Juneau, Alaska. (Associated Press)

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Scientists capture Aedes aegypti mosquito larvae in an attempt to contain the Zika virus in Puerto Rico and elsewhere. (Associated Press)

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Former Marine, Christopher Marquez, was allegedly attacked and robbed in Washington D.C. on Friday by a group of people asking him if he believed black lives mattered. (Image: Screenshot Marine Corps Times)

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This is a Thursday, Feb. 11, 2016, file photo of aedes aegypti mosquitoes in a mosquito cage at a laboratory in Cucuta, Colombia. The World Health Organization says it may be necessary to use controversial methods like genetically modified mosquitoes to wipe out the insects that are spreading the Zika virus across the Americas. (AP Photo/Ricardo Mazalan, File)