Trump administration officials and California clean air regulators emerged from a meeting on Wednesday saying they would keep meeting to work toward resolving their sharp conflict over vehicle emissions and shared the goal of a single national standard.

The two sides discussed Trump's Safer and Affordable Fuel Efficient (SAFE) Vehicles rule that backs freezing national vehicle emissions standards at 2020 levels through 2026, and revokes California's power to set state emissions rules. The California Air Resources Board (CARB) has proposed maintaining strict Obama-era rules mandating rising fuel efficiency requirements annually through 2025.

The officials said in a statement they agreed to hold future meetings aimed at achieving national fuel economy and greenhouse gas emission standards.

Automakers have urged California and the administration to reach agreement, rather than face years of uncertainty. Automakers want looser emissions standards because consumers now favor bigger cars that use more fuel.

And auto makers are concerned that they will not be able to recover the cost of the fuel Saving and emissions control technology required to meet the Obama administrations 2025 targets.

California air regulators said after the White House proposal was published that they plan to keep tightening state vehicle emissions rules despite a Trump administration proposal at the beginning of August. Californias air chief Mary Nichols told Reuters last month that she sees a window to make a deal this fall.

Californias decision is nationally significant because the state is the largest U.S. auto market. Also, a dozen states and the District of Columbia have adopted Californias emissions rules, accounting for more than a third of all U.S. vehicle sales.