- Colin Powell's criticism means four ex-chairmen of the Joint Chiefs of Staff have now bashed Trump | Experts say top military officers rarely criticize the president, and never do so many speak up at once. "I can't think of a precedent," said one. https://www.nbcnews.com/news/military/colin-powell-s-criticism-means-four-ex-chairmen-joint-chiefs-n1227101 157 comments politics