Marilyn Tavenner, administrator of the Centers for Medicare & Medicaid Services, during her testimony Tuesday on Capitol Hill. Shawn Thew/EPA/LANDOV hide caption

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Rep. Randy Neugebauer, R-Texas. Kevin Dietsch /UPI/Landov hide caption

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A gate leading into the Joshua Tree National Park California is latched (though not locked) because of the partial government shutdown. Though national parks are technically closed, national forests remain open — they're too large to close. Robyn Beck/AFP/Getty Images hide caption

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The Lincoln Memorial is officially closed. National parks and monuments are among the parts of the federal government affected by the shutdown. Dennis Brack /Landov hide caption

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Hilary Clinton at last week's Clinton Global Initiative forum in in New York City. /PA Photos/Landov hide caption

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Members of the U.S. Park Service place barricades around the Lincoln Memorial on Tuesday in Washington, D.C. A partial shutdown of the federal government has led to the closing of national parks. Brendan Smialowski/AFP/Getty Images hide caption

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Inside the Capitol, lawmakers are battling over health care and the budget. Outside, many government services may come to a stop at midnight. Win McNamee/Getty Images hide caption

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The federal government remains on track to miss a midnight Monday deadline to fund its operations. Chambers of Congress sharply disagree over a temporary funding bill. Here, the Capitol is seen Saturday. J. Scott Applewhite/AP hide caption

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