So Dickhead has made noises about banning Australian beef because we won't buy theirs.
Why won't we buy theirs? Because they had mad cow disease a couple of years back, so it's a biosecurity risk. (Now they have a mad steer running their country).
What will be the consequence? Well, the US hasn't got enough beef because of the ongoing shortages internally. So we'll sell to other countries at the same price we would have sold it to the yanks, and they will put a mark-up on it and sell it on to the US.
Meanwhile, that third country is subject to larger tariffs than Australia, say 20% instead of 10%, so Trump's burger, still made with Australian beef, costs him about 40% more than it would have if they just kept buying from Australia, and nobody else loses out.
Own goal!