Fiona Hill (2nd L), former National Security Council senior director for Europe and Russia, and David Holmes (2nd R), a staffer from the U.S. Embassy in Ukraine, testify before the U.S. House Intelligence Committee on Capitol Hill in Washington D.C., the United States, on Nov. 21, 2019. The last two witnesses scheduled for publicly testifying before a House panel as part of an impeachment inquiry into U.S. President Donald Trump offered their narratives of events relating to the investigation on Thursday. (Xinhua/Liu Jie)