 Blumenthal has broadcast on RT (formerly known as Russia Today) on many occasions.In December 2015, during an all-expenses paid trip to Moscow, Blumenthal attended RT's "10 Years On Air" anniversary party attended by President Vladimir Putin, then-Lieutenant General Michael Flynn of the United States and English politician Ken Livingstone.In an interview with Tucker Carlson on Fox News in November 2017, Blumenthal defended RT against "the charge that it’s Kremlin propaganda."