On February 4, 2021, Senator Amy Klobuchar, chair of the Antitrust Subcommittee of the Senate Judiciary Committee, introduced a bill entitled “The Competition and Antitrust Law Enforcement Reform Act” (the “Bill”). If enacted, the Bill would fundamentally revise longstanding U.S. federal antitrust laws by forcing the merging parties to shoulder the burden of proof in a variety of common combination scenarios, and would provide regulators with various other powers and augmented resources. In particular, the Bill would position regulators to more aggressively pursue transactions involving nascent or potential competitors, which have also faced heightened scrutiny under European competition laws.