Julian Zelizer

Julian Zelizer is not mentioned in the provided news articles. The articles primarily focus on Donald Trump's business dealings and the potential for presidents to profit from their office, referencing past presidents like Harry Truman who avoided such practices. One article also mentions Robert Mueller and investigations related to Trump. Without any information about Julian Zelizer in the provided context, it is impossible to determine their background, current newsworthiness, recent events related to them, or their current relevance or significance. The articles do not provide any basis for a summary about Julian Zelizer.