These charts reflect the results of the newest Economist / YouGov Poll -- done between February 17th and 19th of a national sample of 1,500 adults (including 1,318 registered voters. The margin of error for adults is 3.1 points, and for registered voters is 2.8 points.
It shows that, by a 15 point margin, people don't want Trump to run for re-election. And, by an 8 point margin, they think it is likely that he would lose if he does run in 2020.
