Back to today’s briefing

Story perspectives

Justice Department Antitrust Chief Resigns Amid UK Political Turmoil

2/10/2026

44 5 Full Breakdown

Summary

Story summary

Mark Hamer, deputy head of the U.S. Justice Department's Antitrust Division, will depart the Trump administration after nearly a year.
He described 2025 as a peak year for civil antitrust enforcement.
He will return to Baker McKenzie, where he led the antitrust practice.
In the United Kingdom, Prime Minister Keir Starmer faces pressure after key aides resign amid controversy over Peter Mandelson's appointment as ambassador to the United States.

History

Historical Context

The U.S. Antitrust Division was established in 1933 amid growing concerns over monopolistic practices during the Great Depression. Influenced by economists advocating for free-market competition, it aimed to enforce antitrust laws like the Sherman Act of 1890. Today, civil antitrust enforcement is projected to peak in 2025, reflecting ongoing challenges in corporate regulation and governance in both the U.S. and the U.K.

1 of 2

Story summary

Mark Hamer, deputy head of the U.S. Justice Department's Antitrust Division, will depart the Trump administration after nearly a year.
He described 2025 as a peak year for civil antitrust enforcement.
He will return to Baker McKenzie, where he led the antitrust practice.
In the United Kingdom, Prime Minister Keir Starmer faces pressure after key aides resign amid controversy over Peter Mandelson's appointment as ambassador to the United States.

1 / 2