They've actually done so numerous times already and have several cases on the docket that look to be leaning against him as well. There's a reason why most serious pundits saw this ruling coming a mile away, because SCOTUS has proven to not be a puppet of the administration.
If you look a little closely you'll see their current project is to establish the "major questions doctrine," which ultimately reduces executive power by stopping Congress from giving it all to the executive. It looks pro-POTUS when it reduces the power of executive agencies, and it looks anti-POTUS when it reduces the power of executive orders. It's really about resetting what powers Congress can delegate.
And even this ruling had 3 of them objecting, claiming tariffs should stand.
Several justices are openly taking bribes
and still this current ruling was a 6-3 vote.
The president doing horribly fascist things with ICE like obliterating habeas corpus? Using the military to murder people in the ocean without trial? That's fine.
Screwing with the money? Not okay.
See also how the prez is allowed to screw with any congressional appointees except the federal reserve.
