If Congress doesn't act to fund the Department of Homeland Security by Friday, then over 200,000 TSA employees won't be receiving paychecks — but many of them will still have to show up to work. Saul Loeb/AFP/Getty Images 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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