Americans for Prosperity, backed by billionaire brothers Charles and David Koch, turned the keys on a seven-figure grassroots campaign to build support for Trump's nominee.

在亿万富豪查尔斯·科赫和大卫·科赫兄弟的支持下，繁荣美国人协会拉开了一场耗资七位数的草根竞选活动，为特朗普提名的候选人拉票。