(J. Scott Applewhite | AP File Photo) Rep. Devin Nunes, R-Calif., the ranking member of the House Intelligence Committee, joined at left by Chairman Adam Schiff, D-Calif., holds up a document he is submitting as the panel prepares to listen to former White House national security aide Fiona Hill, and David Holmes, a U.S. diplomat in Ukraine, on Capitol Hill in Washington, Thursday, Nov. 21, 2019, during a public impeachment hearing of President Donald Trump's efforts to tie U.S. aid for Ukraine to investigations of his political opponents.