I know that there were at some point a bunch of changes to the estate tax made including cutting the max exclusion in half from something like 12MM to 6MM. And also changing the rules based around trusts to try and prevent people from hiding their money from the tax. Are these things still under consideration? Goodness if I know. The list of what's in or out is changing every 3 days.
Though I think there are 2 things that prevent these changes from happening. 1. It's basically the first thing the GOP reverses every, single, time they're in office. 2. A lot of these older politicians have assets over this amount. They can't help but imagine the reduced estate they'll be able to pass on when they die in the next 10-20 years.
In the first version of the social spending bill, they were going to accelerate the sunset of the doubling of the estate tax basic exclusion amount. So instead of dropping from $12M to $6M in 2026, it would happen in 2022. This was one of the revenue generators in that version of the bill.
In the second and current version of the bill (the one put out Thursday this week), that change is not in there.
On a note relevant to this thread, the idea of taxing wealthy people on unrealized gains is also *not* in the second and current version of the bill.
What they talk about changes regularly, but the actual bill texts seem to change less frequently. Although I have stiff doubts as to whether this second version of the bill passes in its current form. It just seems premature based on the posturing I still see going on.
As for your second paragraph, I think your second point is spot on and is true of politicians in both parties. I think the vast majority of members of Congress are millionaires.
Your first point is misleading. The latest increase to the estate tax exemption was in the TCJA in 2017, which was passed and signed into law completely by the GOP, but that was to temporarily add into law increase the exemption, not reverse any reduction. The three bills increasing (or retaining increases in) the estate tax exemption before that, though, were passed on a bipartisan basis in the House, overwhelming bipartisan support in the Senate, and signed into law by Presidents Clinton and Obama. (Sources:
https://www.thebalance.com/exemption-from-federal-estate-taxes-3505630 and Wikipedia.) The net of all this is that the estate tax exemption amount from 1997 through 2017 was based on bipartisan laws signed by Democratic Presidents.