Judy Woodruff:

The Trump administration proposed the biggest rollback today in water protection since the Clean Water Act was passed in 1972.

The move would reduce safeguards to millions of acres of wetlands and thousands of streams as well. This follows an expansion of water regulations under President Obama that was hugely controversial.

Under the prior administration, the government expanded the type of waterways that fall under federal protection to include smaller streams and tributaries that feed into larger bodies of water. Farmers, ranchers and developers say that resulted in essentially a federal land grab.

The new rules will limit oversight substantially, so that it will protect large bodies of water, the rivers that drain into them and nearby wetlands.

Environmentalists are responding that this is a big blow against clean water.

Coral Davenport has been following the latest developments for The New York Times, and she joins me now.

Welcome back to the "NewsHour."

So, Coral, remind us, what were the expanded regulations under President Obama?