Mr. Trump has cultivated the persona of a generous man, repeatedly claiming on television he would donate to charity “out of my wallet” and accepting honors from groups he appeared to support. In fact, an exhaustive investigation by Post reporter David A. Fahrenthold shows that Mr. Trump retooled his foundation about a decade ago to act as an intermediary for other people’s charitable giving, a racket from which Mr. Trump gained in reputation and from which he may even have occasionally profited.

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