California could add as many as five congressional districts favorable to Democrats and leave Republicans with four of the state's 52 House seats, down from the current roster of nine.

"The governor's basically saying that he thinks what another state is doing is wrong, and therefore we should do it too," said Rep. Kevin Kiley.

As Texas Republicans move ahead with redistricting to protect or even expand the GOP’s slim majority in the US House, Democratic-run states, led by California, are pushing forward with their own efforts to draw new maps and add Democratic seats.