Tether and Circle hold a lot of US treasury bonds, but are their holdings significant compared to the overall size of US debt?

I finally took some time to do a little writing on this & pose a few questions we should keep in mind on this topic.

Tether and Circle hold a lot of US treasury bonds, but are their holdings significant compared to the overall size of US debt?

I finally took some time to do a little writing on this & pose a few questions we should keep in mind on this topic.

https://www.jeffcang.com/Contextualizing-the-role-of-stablecoins-in-solving-the-US-national-debt-challenge-11bebaf1da9680c7bb52d5175264ee7f