Who has the power to arrest him for contempt of court?

While we're on the subject, at what point will SCOTUS get fed up with him?

That's not exactly what's happening here. He hasn't refused to follow the supreme court ruling. Instead he's claiming that other laws grant him the authority to impose tariffs.

In some respects he's right. There is a law that very explicitly grants the president the authority to impose tariffs, but only up to 15%, and only for 150 days. It's this law that he'll be using to impose this new 10% global tariff.

He'll likely also be trying to find any kind of legal wiggle room to maintain the existing tariffs, but I doubt he'll get very far with that. At best he might be able to impose a bunch of sector specific tariffs.

Edit to add: I'll note for the sake of completeness that Trump has claimed that the existing tariffs will remain in place. But again, his claim is not that the court has no authority over him, just that there are other legal mechanisms that still give him that power. I suspect that this is just Trump mouthing off. But either way, he's being very careful not to actually defy the court's authority here, and that's a distinction that matters.

Why do they take a photo of him mid shart like that?

Pants shitting meltdown incoming?

So when do we get our money back

Justice Brett Kavanaugh, Trump’s other appointee, wrote the main dissent, joined by Justices Clarence Thomas and Samuel Alito.