Experts, former officials, some lawmakers and international observers have questioned the legality of the strikes.
It comes as lawmakers in the House of Representatives prepare to vote on a deal to end the government shutdown.
The new maps in California favour Democrats and cancel out gains made by Republicans after they redistricted in Texas.
11don MSN
What’s next in the national redistricting fight after California approved a new US House map
The new congressional map approved by California voters marked a victory for Democrats in the national redistricting battle ...
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