Welcome to the Saturday edition of The Conversation U.S.’s Daily newsletter.

In a stinging blow to President Donald Trump’s economic agenda, the Supreme Court yesterday took away perhaps his most-used tool in negotiations with other countries: his tariff bazooka.

In a 6-3 ruling, the court said Trump’s use of a 1977 emergency powers law to impose sweeping tariffs without the consent of Congress was unconstitutional. The president called the ruling a “disgrace” and pledged to use other tools to preserve the import taxes he’s placed on virtually every U.S. trading partner. The decision also raises a big question over whether companies that have already paid some $170 billion because of the now-illegal tariffs will get a refund.

For answers to this and other key questions about the much-anticipated ruling, we turned to Kent Jones, a trade economist at Babson College.

“The Supreme Court decision will make it more difficult for Trump to use tariffs and tariff threats” for political reasons, Jones writes. But that doesn’t mean the president doesn’t have options for replacing the tariffs – they’re just more cumbersome.

This week we also liked stories about the link between the microbiome and aging, the story of a Black woman blamed for serial murders in the Jim Crow South, and why utility industry deregulation has led to higher, not lower, costs for consumers.