These charts are from a new Monmouth University Poll -- done between July 13th and 16th of a random national sample of 800 adults, with a 3.5 point margin of error. It shows Trump job approval is 39%, while disapproval is 52% -- a negative difference of 13 points.
The charts below show that the public disapproves of the meeting Kushner, Trump Jr., and Manafort had with Russian officials. But that has not really affected Trump's job approval. It is about the same as it was before the meeting with Russians became big news.
It seem that Trump's loyal supporters don't care that he (or at least his family and campaign aides) colluded with the Russians to subvert the American electoral process.
