“About one in eight people who voted for President Donald Trump said they would not do so again after witnessing Trump’s tumultuous first six months in office,” according to a Reuters/Ipsos poll of 2016 voters. “While most of the people who voted for Trump on Nov. 8 said they would back him again, the erosion of support within his winning coalition of older, disaffected, mostly white voters poses a potential challenge for the president.