Our current system should allow Congress to control this.
They’re not. That’s the problem.
You could swap it out for a parliamentary structure with the same characters and you’d get the same result. There’s a weird personality cult thing going on and everyone is waiting to see who will break ranks first, lest they get crushed by the retaliatory wrath of Trump calling his followers to oppose a person and Elon Musk dumping a mega war chest on them.
There are signs that people are starting to break ranks, but it looks like they want to see him have to face the consequences of his decisions before they jump in to save him.
This current policy is so bad that they’d be doing him a political favor by jumping in to disallow it. The problem for them is that he would be guaranteed to turn around and blame it on Congress. “My tariff plan was going to work, but Congress interfered!”
If you are persuaded by "The Goodness Paradox" (Richard Wrangham) then you are probably going to think like I do Congress and the Senate acting almost inevitable if Trump does enough damage. The book is speculation/theory on how/why the low level of intra-tribe violence in humans could have evolved. It is literally an order of magnitude less than other species. His theory is in small tribes small men routinely band together to kill an oppressive leader. The result is leaders evolved to be less violent over time. Most of the violence in other species happens because it is the primary tool leaders use to extract resourced from others, so when they do this total in-tribe violence was reduced. It had no effect on the violence between tribes, which is anything has increased in humans. If he's right this behaviour is fairly ingrained in all human males now.
Wrangham's thesis is this behaviour is built on language. In order to kill the biggest and most powerful with little risk, the group had to coordinate and perhaps more importantly a level of trust had to be build up, because if one broke ranks and spilled the beans before the deed was done, the leader could pick off the insurrectionists one by one. The most startling example of this is the men who killed Caesar (some 60 to 70 of them) all sank a knife into his body. Only humans had the tool needed to build up the level of in-group trust: language.
The relevance to overthrowing is Trump needs a concerted whispering campaign that takes months to to create the bonds between the "small men". We've had less than 100 days to enjoy the fruits of Trump's blessings. They've only just become aware of what he is doing to their electoral prospects. Hell, I suspect Trumps big donors like Musk have only woken up to the fact in the last couple of days that they've funded a huge threat to their personal fortunes and the businesses that create and sustain those fortunes. But they are aware now, and as you say the white anting has begun. May it continue post haste.