Of course he wants protection for his folks. So does the President. That’s why they make ‘fair trade deals’ that everyone agrees on.
As for the other stuff you explained...Wow!!!! Politicians and their puppet masters could screw up wet dreams.
Correct - the President must look out for American interests first. And Boris ought to look out for the UK’s interests.
The problem is that there is little overlap.
Right now 11% of British imports are from the US and 7.5% of exports go to the USA. 54% of British imports and exports are to / from the USA.
Most of the UK’s “exports” and a lot of it’s imports are due to the supply chain in Western Europe - to give an analogy, a lot of cars in the US will have parts made across the US, so similarly cars may be assembled in the UK from car seats assembled in France using leather from Italy, tires from Spain, chassis from Germany and an engine made in the Czech republic.
This all flows across the borders without being stopped or charged. The stopping and delay is the bigger issue as factories then need to stock inventory rather than Just-in-time manufacturing (meaning they expect product to arrive at 9 am Wednesday for assembly at 11 am Wednesday. If there is a delay to Friday or even Thursday, that costs money.
The UK from the 80s transitioned from manufacturing to services - the major export - and out of that the majority is financial services for the european market.
Most of what the City offers is offered by Wall Street.
So
1. the USA can’t fully replace what is exported and imported with the rest of the european nations
2. there is open competition in the services market and in agriculture
So a trade deal WILL happen, but it will take time while different lobbies negotiate