The House of Representatives is holding a historic vote today to formalize the impeachment process against President Trump. The probe centers on whether Trump withheld military aid to Ukraine to pressure Ukrainian President Volodymyr Zelensky to investigate Trump’s political rival Joe Biden and his son, Hunter, who served on the board of Burisma Holdings, a Ukrainian energy company. As the House votes today, lawmakers are continuing to question key Trump administration behind closed doors, including the top Russia official on the National Security Council, Tim Morrison. On Wednesday, House Democrats also requested that Trump’s former National Security Adviser John Bolton testify. We speak with California Congressmember Ro Khanna.