Montgomery police block the entrance of Walter Reed National Military Medical Center on Tuesday, Nov. 27, 2018, in Bethesda Md. The Navy says a drill was taking place at the Maryland base that's home to Walter Reed where an active shooter had been reported. Naval Support Activity Bethesda tweeted that no shooter had been found and personnel could move about the Maryland base freely. (AP Photo/Jose Luis Magana) **FILE**
President Trump is shown here in a screen capture from his Oct. 3, 2020 video posted on his Twitter account from his hospital suite at Walter Reed National Military Medical Center in Bethesda, Md. (Twitter/@RealDonaldTrump)
President Donald Trump gives the thumbs-up as he arrives on Marine One on the South Lawn of the White House in Washington, Friday, Feb. 8, 2019, as he returns from his annual physical exam at Walter Reed National Military Medical Center. (AP Photo/Carolyn Kaster)
President Donald Trump is seen through the window of his motorcade vehicle as he is driven to board Martine One at Walter Reed National Military Medical Center in Bethesda, Md., Tuesday, May 15, 2018, en route to Washington. The White House says first lady Melania Trump is hospitalized after undergoing a procedure to treat a benign kidney condition. (AP Photo/Carolyn Kaster)
President Donald Trump holds U.S. Army Sgt. 1st Class Alvaro Barrientos after awarding him a Purple Heart, as his wife Tammy Barrientos stands right, at Walter Reed National Military Medical Center, Saturday, April 22, 2017, in Bethesda, Md. (AP Photo/Alex Brandon)
President Donald Trump, left, points after awarding a Purple Heart to U.S. Army Sgt. First Class Alvaro Barrientos, with first lady Melania Trump, right, and Tammy Barrientos, second from right, at Walter Reed National Military Medical Center, Saturday, April 22, 2017, in Bethesda, Md. (AP Photo/Alex Brandon)
President Donald Trump prepares to award a Purple Heart to U.S. Army Sgt. 1st Class Alvaro Barrientos, with first lady Melania Trump, right, and Tammy Barrientos, second from right, at Walter Reed National Military Medical Center, Saturday, April 22, 2017, in Bethesda, Md. (AP Photo/Alex Brandon)
President Donald Trump prepares to award a Purple Heart to U.S. Army Sgt. 1st Class Alvaro Barrientos, with first lady Melania Trump, right, and Tammy Barrientos, second from right, at Walter Reed National Military Medical Center, Saturday, April 22, 2017, in Bethesda, Md. (AP Photo/Alex Brandon)
President Donald Trump arrives with first lady Melania Trump, to award a Purple Heart to U.S. Army Sgt. First Class Alvaro Barrientos, at Walter Reed National Military Medical Center, Saturday, April 22, 2017, in Bethesda, Md. (AP Photo/Alex Brandon)
President Donald Trump, left, awards a Purple Heart to U.S. Army Sgt. First Class Alvaro Barrientos, with his wife Tammy Barrientos, right, at Walter Reed National Military Medical Center, Saturday, April 22, 2017, in Bethesda, Md. (AP Photo/Alex Brandon)
President Donald Trump shakes hands with U.S. Army Sgt. First Class Alvaro Barrientos, after awarding him with a Purple Heart , as first lady Melania Trump, right, stands with Tammy Barrientos second from right, at Walter Reed National Military Medical Center, Saturday, April 22, 2017, in Bethesda, Md. (AP Photo/Alex Brandon)
President Barack Obama walks to the presidential limousines after stepping off Marine One at Walter Reed National Military Medical Center in Bethesda, Md., Wednesday, April 29, 2015, for a visit with wounded military personnel. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama rides in the presidential limousines at Walter Reed National Military Medical Center in Bethesda, Md., Wednesday, April 29, 2015, for a visit with wounded military personnel. (AP Photo/Pablo Martinez Monsivais)