WASHINGTON, D.C. –  U.S. Senator Peter Welch (D-Vt.) led Senators Amy Klobuchar (D-Minn.), Jeff Merkley (D-Ore.), Ben Ray Luján (D-N.M.), Michael Bennet (D-Colo.), and Mazie Hirono (D-Hawaii) in introducing the Digital Integrity in Democracy Act, legislation to increase accountability of social media platforms that knowingly…