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In this Aug. 30, 2013, file photo, Americans for Prosperity Foundation Chairman David Koch speaks in Orlando, Fla. Koch is stepping down from the Koch brothers network of business and political activities. The 78-year-old cited health reasons in a letter distributed to company officials on Tuesday, June 5, 2018. (AP Photo/Phelan M. Ebenhack, File)

In this Aug. 30, 2013, file photo, Americans for Prosperity Foundation Chairman David Koch speaks in Orlando, Fla. Koch is stepping down from the Koch brothers network of business and political activities. The 78-year-old cited health reasons in a letter distributed to company officials on Tuesday, June 5, 2018. (AP Photo/Phelan M. Ebenhack, File)

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