US Senator Elizabeth Warren has urged Treasury Secretary Janet Yellen to adopt more comprehensive Anti-Money Laundering and Combating the Financing of Terrorism (AML/CFT) measures for stablecoins. In a letter, Warren supported the Treasury's proposal to expand its sanctions powers to blockchain validator node operators. She emphasized that these authorities must be included in any legislation to regulate the $157 billion stablecoin market. Warren's comments were not in reference to the recent stablecoin bill introduced by Senators Kirsten Gillibrand and Cynthia Lummis, but rather a forthcoming bill from the House of Representatives.