Three US Senators, Elizabeth Warren, Tim Kaine, and Chris Van Hollen, have written a letter to the White House and Treasury Department urging them to take action against North Korea's use of cryptocurrency to fund its nuclear program and evade sanctions. The senators cited reports that North Korean hackers have stolen over $3 billion worth of crypto since 2018 to fund their missile program. The US Treasury Department has already added Tornado Cash to its list of sanctioned entities due to concerns over crypto being used to fund North Korea's nuclear program. Senator Warren has been a vocal advocate for cracking down on the illicit use of cryptocurrencies.