The president temporarily waived clean-air rules for industrial facilities that spew cancer-causing gases. Then his appointees worked to gut the regulations altogether.

The charges intensified the administration’s efforts to go after the law enforcement and intelligence personnel who cast doubt on unsubstantiated claims that Joseph R. Biden Jr. engaged in corrupt dealings in Ukraine.

© Erin Schaff/The New York Times

From Barack Obama to Donald Trump, ideology has infused the interpretation of the federal law banning sex discrimination on college campuses.

© Lauren Petracca for The New York Times