The Supreme Court heard two challenges to the Biden administration’s COVID-19 vaccination mandates this month. It blocked one mandate and upheld another, giving some observers whiplash.  How did the court come to such different rulings on similar workplace mandates, and what do the rulings say about how the court views the federal government as a whole? Guest: Mark Joseph Stern, staff writer covering courts and the law for Slate.  If you enjoy this show, please consider signing up for Slate Plus. Slate Plus members get benefits like zero ads on any Slate podcast, bonus episodes of shows like Slow Burn and Dear Prudence—and you’ll be supporting the work we do here on What Next. Sign up now at slate.com/whatnextplus to help support our work. Learn more about your ad choices. Visit megaphone.fm/adchoices