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WASHINGTON — The country’s top protector of the environment’s first U.S. Senate appearance should occur before the Environment and Public Works Committee, the chairman of the committee told Transport Topics on July 11.

An Environmental Protection Agency advisory board is reviewing the quality and relevance of scientific and technical information used to justify repealing an Obama administration regulation that limits the production of glider trucks.

Lawsuits over EPA’s April fuel economy determination are more than just a pre-emptive strike, challengers say: They’re an effort to force the agency to consider thousands of pages of its own data as it considers weakening emissions limits for passenger cars.

The Trump administration announced that fuel-efficiency regulations for cars and light trucks are too stringent and must be revised, formally beginning a process sought by the U.S. auto industry to rollback anti-pollution targets.

The Trump administration will argue that the high cost of meeting Obama-era fuel economy standards discourages motorists from trading in less-efficient vehicles, as it sets about weakening the rules, said people familiar with the discussions.

California and the Trump administration are on a collision course over auto-efficiency regulations that could lead the White House to deploy the nuclear option: revoking the state’s cherished power to set its own limits on air pollution.

The Trump administration’s chief environmental regulator signaled a coming showdown with California, warning the state won’t dictate the future of ambitious automobile fuel economy regulations enacted by the Obama administration.

Despite pressure from biodiesel producers to require greater minimum production levels of biomass-based diesel, the U.S. Environmental Protection Agency has stuck to its proposed plan to maintain the 2018 level of 2.1 billion gallons for 2019.

Whatever federal authorities may or may not do to alter parts of the U.S. Phase 2 regulation of greenhouse gases from trucks, California will keep regulations in place that are at least as tough as the October 2016 final rule, and might even get more strict and encompass aspects of nitrogen oxide emissions.