Minnesota Democratic Sen. Amy Klobuchar released a sweeping antitrust reform bill on Thursday that would present Big Tech companies such as Facebook and Google with a significant risk of being broken up and prevent dominant firms from acquiring smaller ones.

The bill would rewrite competition laws to impose larger penalties on antitrust violations, set higher standards for approving mergers, and give antitrust enforcers such as the Federal Trade Commission and the Department of Justice greater tools and funding to hold companies accountable for illegal activity.