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President Donald Trump and first lady Melania Trump walk on the South Lawn of the White House in Washington, Tuesday, Nov. 12, 2019, as they return from New York.  (AP Photo/Steve Helber)
Rep. Adam Schiff, D-Calif., second from right, speaks with members of the media after former deputy national security adviser Charles Kupperman signaled that he would not appear as scheduled for a closed door meeting to testify as part of the House impeachment inquiry into President Donald Trump, Monday, Oct. 28, 2019, on Capitol Hill in Washington. Standing with Schiff are Carolyn Maloney, D-N.Y., from left, Rep. Jamie Raskin, D-Md., and Rep. Eric Swalwell, D-Calif. (AP Photo/Patrick Semansky)
Rep. Devin Nunes, a longtime Trump ally from California, will argue that none of the witnesses has first-hand knowledge of the president's actions. (File photo from Capitol Hill in Washington, Thursday, Sept. 26, 2019. AP FILE Photo/Pablo Martinez Monsivais)
FILe - In this Oct. 22, 2019, file photo Ambassador William Taylor, is escorted by U.S. Capitol Police as he arrives to testify before House committees as part of the Democrats impeachment investigation of President Donald Trump, at the Capitol in Washington. (AP Photo/J. Scott Applewhite, File)
FILE - In this Oct. 15, 2019, file photo, Deputy Assistant Secretary of State George Kent leaves Capitol Hill in Washington, after testifying before congressional lawmakers as part of the House impeachment inquiry into President Donald Trump. (AP Photo/Andrew Harnik, File)