Why Trump wants to relax automotive fuel efficiency standards now

The Trump administration wants to roll back another federal regulation intended to reduce global warming. Obama-era automobile fuel efficiency rules require U.S. vehicles to increase mileage standards by an average of 5 percent per year from 2021 through 2026. Tuesday’s move would reduce the improvement threshold to 1.5 percent. The Washington Post’s Juliet Eilperin joins John Yang to discuss.

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