You don't understand that US chronic trade and fiscal deficits undermine the USD?

You don't understand that the tariffs would both reduce US trade and fiscal deficits?

The tariffs are an obvious if very crude short term defense of the USD. They do not however address the deeper structural decline of US competitiveness vs China.

The basis of the Petrodollar is its domination as the currency of international trade settlement via SWIFT.

Chinas mBridge directly and deliberately challenges that hegemony.

USD faces a direct challenge from China, the largest strongest trading economy and the trends are all in Chinas favour. China has won the trade war.

BRICS including the Saudis are signed up to mBridge and the transition will be swift.

Why did US controlled BIS end its patronage of the mBridge protocol?

Why has Trump directly and repeatedly threatened all BRICS members with 100% tariffs should any of them dare to use an alternative to USD for trade payments?

Because Trump knows what is at stake. He knows about mBridge. He is rightly scared. Loss of USD trade payments hegemony would leave USA rapidly insolvent.

Trade payments and trade and fiscal balances are what ultimately determine the strength of currencies- and USA has been losing on the latter two for 7 decades, and now only clings to the first which is an outdated legacy mechanism based on the antiquated, slow, costly and inefficient analogue SWIFT protocol.