Research has found that migrants and refugees don't spread diseases to host populations, though migrants themselves are often at higher risk of illness because of poor living conditions.
Housing advocates, immigrants' rights groups, social policy think tanks, and public housing management organizations have united in opposition to the rule.
Now that Trump has ousted officials who opposed a shock-and-awe arrest campaign, funding limitations may present the most serious barrier to such a plan.
A federal court has decided to allow the administration to continue sending asylum seekers back to Mexico as the lawsuit against the Remain in Mexico plan makes its way through the legal system.
The Department of Homeland Security will use the tests to identify what it calls fraudulent families. But advocates say the plan raises privacy concerns.