You can read that President Trump’s approval ratings aren’t very good. When you read that, you should ask yourself, "Compared to what?"
Here is the actual polling data for the most recent three presidents who had a second term, all done on March 5 of the second year of their second term.
🔴Trump: 43.3%Looks to me like Trump is doing better than either of his two predecessors who had a second term, certainly not worse.
🔵Obama: 42.5%
🔴Bush: 38.7%