On December 6, the U.S. Department of Justice filed its own federal lawsuit against the new Texas U.S. House and State House district boundaries. There were already six or seven other lawsuits pending against the Texas redistricting plans. This one is U.S. v State of Texas, w.d., 3:21cv-299. Here is the Complaint.
Even if you don’t intend to read the Complaint, it is worthwhile to scroll through it to see some of the maps, especially the Dallas area U.S. House district maps on page 18.
The lawsuit charges Texas with violating section 2 of the federal voting rights act.