Daily Kos's Lisa Needham writes that Democratic Senators Ron Wyden and Angela Alsobrooks have begun investigating Robert F. Kennedy Jr.'s 2019 Samoa trip, seeking documents from Children's Health Defense on the trip, his campaign, and his confirmation. Kennedy testified the trip had "nothing to do with vaccines," but he had written Samoa's prime minister on Children's Health Defense letterhead questioning MMR vaccines, and the trip was followed by 5,697 measles cases and 83 deaths; Needham expects the inquiry could later ground impeachment.