President Donald Trump and first lady Melania Trump visit Arlington National Cemetery for the annual Flags In ceremony ahead of Memorial Day Thursday, May 23, 2019, in Arlington, Va. (AP Photo/Andrew Harnik)
Acting United States Attorney General Matt Whitaker, center, attends a wreath laying ceremony at the Tomb of the Unknown Soldier during a ceremony at Arlington National Cemetery on Veterans Day, Sunday, Nov. 11, 2018, in Arlington, Va. (AP Photo/Andrew Harnik)
Acting United States Attorney General Matt Whitaker, center, attends a wreath laying ceremony at the Tomb of the Unknown Soldier during a ceremony at Arlington National Cemetery on Veterans Day, Sunday, Nov. 11, 2018, in Arlington, Va. (AP Photo/Andrew Harnik)
Acting United States Attorney General Matt Whitaker, center, and Labor Secretary Alex Acosta, right, attend a wreath laying ceremony at the Tomb of the Unknown Soldier during a ceremony at Arlington National Cemetery on Veterans Day, Sunday, Nov. 11, 2018 in Arlington, Va. (AP Photo/Andrew Harnik)
President Donald Trump speaks during a Memorial Day ceremony at Arlington National Cemetery, Monday, May 29, 2017, in Arlington, Va. (AP Photo/Evan Vucci) ** FILE **
President Donald Trump applauds as he pauses during his speech at a Memorial Day ceremony at Arlington National Cemetery, Monday, May 29, 2017, in Arlington, Va. (AP Photo/Evan Vucci)
President Donald Trump sings the National Anthem during a Memorial Day ceremony at Arlington National Cemetery, Monday, May 29, 2017, in Arlington, Va. (AP Photo/Evan Vucci)
President Donald Trump pauses as he visits Section 60 of Arlington National Cemetery after a Memorial Day ceremony Monday, May 29, 2017, in Arlington, Va. (AP Photo/Evan Vucci)
President Donald Trump participates in a wreath laying ceremony at Arlington National Cemetery, Monday, May 29, 2017, in Arlington, Va. (AP Photo/Evan Vucci)
President Donald Trump speaks during a Memorial Day ceremony at Arlington National Cemetery, Monday, May 29, 2017, in Arlington, Va. (AP Photo/Evan Vucci)
President Donald Trump lays a wreath at The Tomb of the Unknown Solider at Arlington National Cemetery, Monday, May 29, 2017, in Arlington, Va. (AP Photo/Evan Vucci)
President Donald Trump lays a wreath at The Tomb of the Unknown Solider at Arlington National Cemetery, Monday, May 29, 2017, in Arlington, Va. (AP Photo/Evan Vucci)
President Barack Obama, center, arrives with Maj. Gen. Bradley A. Becker, right, for the wreath laying ceremony at the Tomb of the Unknowns, on Memorial Day, Monday, May 30, 2016, at Arlington National Cemetery in Arlington, Va. (AP Photo/Pablo Martinez Monsivais)
Section 60, where many of the soldiers who died in Iraq and Afghanistan are buried at Arlington National Cemetery in Arlington, Va. (AP Photo/Andrew Harnik)
President Barack Obama listens as Defense Secretary Ash Carter speaks in the Memorial Amphitheater at Arlington National Cemetery in Arlington, Va., Monday, May 25, 2015, during a Memorial Day ceremony. (AP Photo/Pablo Martinez Monsivais)
President Obama, accompanied by Maj. Gen. Jeffrey S. Buchanan, left, commander of the U.S. Army Military District of Washington, lays a wreath at the Tomb of the Unknowns, with the aid of Sgt. 1st Class John C. Wirth, on Memorial Day, Monday, May 25, 2015, at Arlington National Cemetery in Arlington, Va. (AP Photo/Pablo Martinez Monsivais)