Techub News reported that according to The Block, US Senators Elizabeth Warren and Roger Marshall expressed concerns about the stablecoin Tether in a letter to US Secretary of Defense Lloyd Austin and Treasury Secretary Janet Yellen over the weekend.

The letter stated that they are highly concerned about countries such as Russia, Iran and North Korea relying on cryptocurrencies to evade sanctions, and that the national security threats posed by cryptocurrencies require a corresponding response from the US defense community. Tether said it is working with law enforcement to track assets and catch criminals.