The former New York congressman has little experience in environmental policy. He is expected to follow orders to weaken climate rules.

Automakers and even some Republicans may fight to preserve funds, and environmental activists will likely sue, but some experts said that some changes may not survive legal challenges.

Hino Motors, a Toyota subsidiary, will plead guilty to conspiracy charges and pay penalties for deceiving regulators about its diesel engines, the E.P.A. said.

State regulators said the measures would probably have been rejected by the Trump administration and that they would focus on homegrown legal strategies instead.