He heard Iran was charging for passage and wanted in?

My guess is: There are some ships passing, so he's blocking them too. Forcing China and Europe to make them act the way he wants. (TL'DR He liked the Iran's plan and he's coping it, he's a fucking idiot)

Trump: Yo dawg, I heard you like blockades.

So I blockaded your blockade so you can stop overseas trade while I crash the markets.

Double negatives or something... He doesn't need no education.

You're not blockading me, I'm blockading you! I bet the gulf states regret giving him all those gifts now...

And Iran probably shoots the first boat USA lets through, so USA wants to end the blockade by blockading, which will be blocked by Iran.

ofcourse he's not blocking the blockade... he's merely imitating it :D

Apparently not, since they continue to let the clown show continue. Congress literally is not checking or balancing shit.

And in this case he actually is mad.

That's exactly what Putin has been doing for years. Unfortunately Putin is pulling it off quite well.

We're just going to take Ukraine, and then likely whatever country looks easiest to take next. But if anyone else got involved in these conflicts I will totally launch my nukes all over the place! You just watch, I'll do it, I'm fuckin nuts!

Don't even think about sending troops, because that would add fuel to an already dangerous situation (that we manufactured and could totally end at any time).

Joining in and doing what their enemy is already doing and which they're been unable to stop, is literally the only way the US and the Trump Administration can claim they're winning anything in this war.

It's also pretty much how the Far-Right in at least America and Britain does politics: if civil society momentum builds up in a direction which isn't at all something they started or even wanted, rush to the front of the crowd and shout "Follow me!".

The thing is, it doesn't quite work at swindling people into thinking you're a great leader when you don't have a thoroughly captured Press conveniently "forgetting" that they didn't actually started it and spinning that as "leadership" of and the result as a "victory" for the Far-Right leader.

So at least outside the US and in the context of their war against Iran the whole thing looks incredibly stupid, maybe even derranged, even will the "geniouses" at the White House think this will make America and Trump look like winning.

PS: There is one take which makes them actually seem intelligent (in the kind of "intelligence" a low-level thief would display) - that the actual individuals in the Trump Administration, including Trump himself, are doing it purely to personally profit from front-running Trump's announcements. This would work but the returns would keep on getting smaller and smaller as the Market stops believing Trump's words and/or expecting that sufficient people believe them for his words to cause market movements.

Yes, the only ships getting through before were Iranian or their allies like China. The real threat is if US allies like France or Japan cut separate deals with Iran to move their own ships through the strait. This would undermine the US position.

Blockading the strait cuts off China and keeps other nations from circumventing the US.

Yes. The logic is... I mean clearly it's because.... Anyway, yes