(KRON) -- California Gov. Gavin Newsom has responded with a simple message to a Republican lawsuit challenging Proposition 50.

"Good luck, losers," Newsom's office tweeted on Wednesday.

The lawsuit was filed by the Dhillon Law Group, Assemblyman David Tangipa, 18 California voters, and the California Republican Party, according to a post on the party's Facebook page. In a video posted to social media, Mike Colombo, a San Francisco lawyer with the Dhillon Law Group, said the map enacted by Prop 50's passage was "unconstitutional."

"The map is designed to favor one race of California voters over others. This violates the 14th amendment's guarantee of equal protection under the law, and the right under the 15th amendment, to not have one's vote abridged because of race," Colombo argued. "W

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