Who becomes President if Trump is removed?

White House National Security Advisor Robert O’Brien stands behind U.S. President Donald Trump as he salutes the transfer cases holding the remains of U.S. Army soldiers Chief Warrant Officer David Knadle and Chief Warrant Officer Kirk Fuchigami, who were killed November 20 in a helicopter crash while supporting ground troops in Afghanistan, during a dignified transfer at Dover Air Force Base, in Dover, Delaware, U.S. November 21, 2019. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY