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.

After Texas moved forward on a new Trump-backed congressional map this week, California Gov. Gavin Newsom responded, "It's on," moving forward on his own redistricting plan that favors Democrats.

California's Democratic Legislature is expected to counter Texas' mid-decade redraw of its congressional map with one of its own.