President Trump takes action to roll back another environmental regulation. The Clean Water Rule extends federal authority over smaller streams and marshes, but farmers, builders and others say it goes too far.

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ROTT: But his signature does little immediately. Michael Wara of Stanford University says making a new rule or undoing the current one could take years.

MICHAEL WARA: There will be the opportunity to comment on the rule. There will be the opportunity to challenge the rule in court if EPA’s response to those comments is unsatisfactory.