Three former Environmental Protection Agency leaders sounded an alarm Friday, saying rollbacks proposed by EPA Administrator Lee Zeldin endanger the lives of millions of Americans and abandon the agency's dual mission to protect the environment and human health.

ABC News’ Stephanie Ramos talks to former EPA Administrator Gina McCarthy on the Trump administration’s rollback of clean air and water protections.

The Trump administration announced a blitz of pollution and climate regulation rollbacks at the U.S. Environmental Protection Agency that target, among other things, the agency’s landmark finding that greenhouse gas emissions harm public health.

In a barrage of pronouncements Wednesday, the Trump administration said it would repeal dozens of the nation’s most significant environmental regulations. EPA Administrator Lee Zeldin described it as "the greatest day of deregulation our nation has seen.

The bipartisan trio branded the Trump administration's rollback plans as a stark departure from the agency's mission.