FILE PHOTO: Stickers bearing the Facebook logo are pictured at Facebook Inc's F8 developers conference in San Jose, California, U.S., April 30, 2019. REUTERS/Stephen Lam/File Photo

WASHINGTON (Reuters) - Three U.S. senators who have been frequent critics of U.S. tech giants wrote a letter to the Federal Trade Commission on Tuesday to criticize its reported settlement with Facebook Inc.

U.S. Senators Edward Markey, Richard Blumenthal, who are Democrats, and Josh Hawley, a Republican, told the agency that a $5 billion settlement, which was reported on Friday, “is woefully inadequate.”