Two Democratic senators, Ron Wyden and Angela Alsobrooks, are investigating whether Health and Human Services Secretary Robert F. Kennedy Jr. lied to Congress about his 2019 Samoa trip, after The Associated Press and The Guardian published documents refuting his testimony that the visit had nothing to do with vaccines. Their letter to the anti-vaccine nonprofit Children's Health Defense, which Kennedy formerly chaired, demands documents by December 4, 2026, and the inquiry is among many Democrats plan into the Trump administration after regaining Congress; the department calls any claim Kennedy lied outright defamatory.