To be fair, and to be scientific about it, we should choose another subpopulation for equal focus, so we can measure the effects of our added attention. I suggest starting with politicians.
She is noting that the Trump administration is engaging in an effort to find more crime committee by immigrants, and she notes that when you look for this, you will generally find it.
It’s what I call a self-licking ice cream cone, and her suggestion to focus on politicians as a statistical control is both methodologically reasonable and delicious snark.