Enlarge / The dome of the United States Capitol Building in Washington, DC. (credit: Getty Images | Phil Roeder)

The bill attempts to limit the ability of dominant firms to “unfairly preference” their own products or services in a way that would harm competition. For example, Apple and Google could not rank their own apps higher than competitors’ on app stores or in searches. With five Republican senators voting alongside Democrats, the bill has a reasonable chance of passing once it hits the Senate floor. A similar bill has been introduced in the House.

“We haven’t meaningfully updated our antitrust laws since the birth of the Internet,” said Senate co-sponsor Amy Klobuchar (D-Minn.) in a committee hearing today. “We have to look at this differently than just startup companies in a garage. That’s not what they are anymore.”