Idk, but it may also be a ploy to disfranchise voters (if a passport is required to vote), as this hits Democrats voter potential harder.
However, I think it is not causal because under- or nonpayment of child support is linked to financial difficulties and income disparities, which non-White people are experiencing at significantly higher rates.
[1] https://www.irp.wisc.edu/wp/wp-content/uploads/2024/01/CSRA-...
[2] https://www.pewresearch.org/politics/2024/04/09/partisanship...