California’s congressional GOP delegation on Thursday urged Gov. Gavin Newsom to reconsider the Advanced Clean Trucks rule passed by the Air Resources Board in 2020.

In a letter to Newsom, the lawmakers argued that converting to ZEV trucks would hurt the supply chain, energy grid and economy, echoing the concerns of the California Trucking Association. They also pointed out that agriculture is particularly vulnerable in California’s energy transition, since rural regions have little to no EV infrastructure.

The Republicans instead called for promoting more efficient engines and fuel sources with less of a carbon footprint, like propane and natural gas.

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In a statement, Rep. David Valadao argued Newsom is “once again putting the interests of extreme environmentalists over hardworking Californians.”

CARB is set to approve a 100% mandate on ZEV truck sales for 2036. The Advanced Clean Fleets regulation will go before the board on April 27.