Republican legislators in California announced Wednesday that they are sending a letter to the U.S. Department of Justice and to the U.S. Attorneys representing California, calling for a potential federal investigation into who is behind the proposed new congressional maps in California and how they were constructed.

State legislators are scheduled to hold floor votes on Thursday, according to a schedule from Democratic leadership.

The California Supreme Court on Wednesday rejected a petition filed by state Republican legislators seeking to halt Gov. Gavin Newsom’s (D) plan to redistrict California’s congressional map. “Petitioners have failed to meet their burden of establishing a basis for relief at this time under California Constitution article IV,