UFO congressional hearing: what to know and how we got here

David Grusch, a whistleblower ex-intelligence official, is among the witnesses slated to appear before House committee hearing

A House of Representatives committee is set to hold an eagerly-awaited hearing on UFOs on Wednesday, which is expected to see remarkable claims regarding extraterrestrial life repeated in the most high-profile setting yet.

David Grusch, a whistleblower former intelligence official who in June claimed the US has possession of intact and partially intact" alien vehicles, is among the witnesses slated to appear, and will repeat his allegations in front of a seemingly supportive line-up of congressmen and women.