Good morning.

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Today’s introduction comes from Adam Nagourney, our Los Angeles bureau chief.

California Republican leaders have been on a mission to rebuild their struggling party as the state turns increasingly Democratic and pushes farther left on such issues as immigration and climate change. In the latest example, the Republican leader of the State Assembly, Chad Mayes, persuaded some Republicans to join with Democrats in voting to extend cap-and-trade, California’s signature emission reduction program.

Make that the former Republican leader of the State Assembly.

Mr. Mayes announced Thursday that he was stepping down in the face of criticism from conservatives over his vote. Some of them assailed Mr. Mayes for helping to pass a Democratic agenda item that they described as economically damaging and against party orthodoxy.

Given the overwhelming number of Democrats in Sacramento, the ouster is unlikely to have much effect on the way California is governed. But by any measure, it is a setback for party leaders trying to reposition the on-the-outs California Republican Party in the age of President Trump.