https://www.reuters.com/article/us-usa-election-facebook/biden-campaign-asks-facebook-twitter-and-google-to-take-down-trump-ad-idUSKBN1WQ2AS

U.S. Democratic presidential candidate Joe Biden's campaign sent letters over the last week to Facebook Inc, Twitter Inc and Alphabet Inc's Google, asking them to take down a social media ad from President Donald Trump which the Biden campaign said contained false claims.