WESTERVILLE, Ohio — In the last few days, Joe Biden has unveiled a new government ethics plan and vowed that his family members would do no business overseas during a Biden presidency. His son, Hunter Biden, said he would step down from his role with a Chinese investment firm, and sat for his first television interview of the campaign. And in Iowa, the elder Biden delivered a fist-pounding diatribe against President Donald Trump, casting him as the embodiment of public corruption.
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