Sens. John McCain (R-Ariz.), Amy Klobuchar (D-Minn.), and Mark Warner (D-Va.) will introduce a bipartisan bill Thursday intended to force digital companies to be more transparent about their advertising sales. McCain signed on to the Democrats' bill Wednesday. The effort was sparked by the revelation that Facebook sold more than $100,000 worth of ads to a Kremlin-linked Russian company during the 2016 election; Google later revealed it had sold $4,700 worth of similar ads.