I don't think Jpow cares about the stock market.
Just like he doesn't care about the housing market.
As he shouldn't, TBH. The fed's dual mandate is maximal employment and price control. If you listen to him speak he is very non emotional and won't comment on anything political.
Furthermore, tariffs are pro inflationary, that is unless we go into a recession and no one has a job or any money to spend, then maybe demand goes down, and along with it, price.
QE will be counter to this objective. As are rate cuts, I don't see any rate cuts happening if these tariffs stick, in fact, there might be hikes.
I think we have one of two scenarios:
1) World capitulates to Trump (whatever that means) or enough to let Trump declare victory; tariffs lift, economy and market goes zoomies.
2) Tariffs stick. We hit recession around summer time. Labor market finally breaks. Trump gets the rate cuts that he's after.