According CNN he has got 34% approval rating from Latinos, granted the error margin 12% is big in their poll.
Let D candidates focus on midwestern white voters in 2020. If Trump can win 34% Latino voters plus 2% more black voters led by Kanye West on top of his 2016 election votes, he will win.
Link: https://www.cnn.com/videos/politics/2019/03/18/cnn-poll-hispanic-support-latinos-donald-trump-marquez-pkg-ebof-vpx.cnn