Three US senators are urging Treasury Secretary Janet Yellen to sanction Chinese Internet of Things (IoT) company Tuya Smart, calling the New York-listed company a national security threat that undermines Americans’ privacy. Republican senators Marco Rubio, Rick Scott and Tom Cotton said the Chinese company is required to share user data with its government under the country’s Data Security Law , which went into effect this month, in a public letter published on the US Senate’s website on Friday. China’s legal data-sharing requirements have been an oft-cited national security concern in the US. “Cyber and national security experts have already…