Trump's EPA recently announced that it was rolling back yet another big Obama-era climate rule. This time, the target was a rule on oil and gas emissions of methane, the powerful greenhouse gas that is the main component of natural gas. The Obama administration created the rule in 2016 and some big oil companies actually wanted the administration to keep it. But the Trump administration did away with it anyway. Why? 

Our guest is Tim Puko. He covers energy policy at the Wall Street Journal and he explains that there is a legal strategy at play aimed at future climate regulations.