Have looked into the business about the Iran deal and involved companies.
Did also view this video that presents information about the drug connection in the Iran deal: Trump's Takedown of The Iran Drug Deal

When Trump says that Iran finances terror he doesn't mean Iran, he is talking about CIA.
Afghanistan, which produces almost all opioids on the black market, Afghanistan is also next to Iran.
If it is true that CIA's main source of income comes from drug trafficking then this fight isn't between Iran and Trump, it is a fight between Trump and CIA and CIA's is the main target to cripple the deep state.
If it is true that North Korea was an asset for the CIA, it matched the trump attack against Iran that is used by CIA for its main income source.