Here is a snippet.
And the movement has come from within key portions of his base. He is:
Down significantly among suburban men, a net-positive approval rating of 51-to-39 percent to a net-negative of 42 percent approve, 48 percent disapprove. That's a net change of down 18 percentage points.
Down a net of 13 points among white evangelicals, from 73-to-17 percent approve to 66-to-23 percent approve.
Down a net of 10 points among Republicans, from 90-to-7 percent approve to 83-to-10 percent.
Down marginally among white men without a college degree, from 56-to-34 percent approve to 50-to-35 percent approve, a net change downward of 7 points.
https://www.npr.org/2019/01/17/685539207/poll-trump-approval-down-slips-with-base