This is the newest Economist / YouGov Poll -- done between July 23rd and 25th of a random national sample of 1,500 adults (including 1,282 registered voters), with a 3.1 point margin of error.
It shows there has been no real improvement in Trump's job approval numbers. Only 39% approve of the job he is doing, while 51% disapprove -- a negative gap of 12 points. Furthermore, there is only one demographic group giving Trump majority job approval -- Republicans. All other groups show more people disapproving than approving.
