NPR has posted a story by Nina Totenberg suggesting that there are simmering tensions among the justices on the Supreme Court. From the article, "Supreme Court justices aren't 'scorpions,' but not happy campers either":
. . . anybody who regularly watches Supreme Court arguments is used to seeing some testy moments in both big and little cases. But you don't have to be a keen observer these days to see that something out of the ordinary is happening.
Some of it is traceable to the new conservative supermajority, including three Trump appointees, a court that may well end up more conservative than any since the 1930s. It's a majority that has evidenced less and less respect for precedent, or the notion of deference to Congress in setting policy.
So it's not surprising that the court's three liberal justices would be upset. . . .
It's not simply an ideological split, according to Totenberg. She reports that the conservatives may have some frustrations with each other.