Why does Trump want to use Bitcoin as a national store of value?

For example, today the US dollar is 40 trillion, and the Chinese yuan is 300 trillion.

We issue currency just like the dollar does.

Is it to maintain the exchange rate or to sustain the economy?

In the end, the water has filled up to the moon, and sovereign currencies haven’t yet shown dominance.

In the past 20 years, trade had to be conducted in US dollars, but now it can be settled in multiple currencies, putting the dollar's status at risk.

Bitcoin has a supply limit, and the US holds the most, not subject to foreign exchange controls; perhaps it’s better to harvest in another way.