The Donald Trump administration's road to economically choke Iran will have to go through China - if it wants to cripple the Middle East country. However, with a fragile trade peace in place between the world's two largest economies, it's unclear whether the Trump administration would choose to take on China at all. One thing is clear: US Treasury Secretary Scott Bessent's warning that the US could launch an "economic D-Day" against Iran could put Washington on a collision course with China, its biggest trading partner. But, Bessent's statements have so far been evasive when it comes to action against Chinese companies for aiding Iran's trade.