The crowd starts to fill in along the National Mall before the swearing in of Donald Trump as the 45th president of the Untied States during the 58th Presidential Inauguration at the U.S. Capitol in Washington. Friday, Jan. 20, 2017 (AP Photo/Carolyn Kaster)
Members of the U.S. Park Police investigate at the site of a reported shooting near the National Mall in Washington on Tuesday, Aug. 4, 2015. (Associated Press)
Pat Monahan, lead singer of Train, performs with the Washington Monument in the background at the Global Citizen 2015 Earth Day on the National Mall, Saturday, April 18, 2015, in Washington. (Photo by Nick Wass/Invision/AP)
President Barack Obama and Japanese Prime Minister Shinzo Abe visit the Lincoln Memorial on the National Mall in Washington, Monday, April 27, 2015. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama, left, and Japanese Prime Minister Shinzo Abe visit the Lincoln Memorial, looking toward the Washington Monument, on the National Mall in Washington, Monday, April 27, 2015. (AP Photo/Pablo Martinez Monsivais)
With the Capitol in the background, Army veteran David Dickerson of Oklahoma City, Okla., joins others to place 1,892 flags representing veteran and service members who have died by suicide to date in 2014, on the National Mall in Washington on March 27, 2014. (Associated Press) **FILE**
Michael Harold of Washington, D.C. wears American flag sox as he jogs on the National Mall on Veterans Day, Washington, D.C., Tuesday, November 11, 2014. (Andrew Harnik/The Washington Times)
Michael Harold of Washington, D.C. wears American flag sox as he jogs on the National Mall on Veterans Day, Washington, D.C., Tuesday, November 11, 2014. (Andrew Harnik/The Washington Times)
Musicians perform during sound checks the afternoon before the Concert for Valor on the National Mall, Washington, D.C., Monday, November 10, 2014. (Andrew Harnik/The Washington Times)
Musicians perform during sound checks the afternoon before the Concert for Valor on the National Mall, Washington, D.C., Monday, November 10, 2014. (Andrew Harnik/The Washington Times)
Musicians perform during sound checks the afternoon before the Concert for Valor on the National Mall, Washington, D.C., Monday, November 10, 2014. (Andrew Harnik/The Washington Times)
Musicians perform during sound checks the afternoon before the Concert for Valor on the National Mall, Washington, D.C., Monday, November 10, 2014. (Andrew Harnik/The Washington Times)
A tea party rally on the National Mall shows evidence of the grassroots fervor that still makes the movement a 'powerful' force, according to a Gallup poll and analysis. (Andrew Harnick/The Washington Times)
This undated handout image provided by Gehry Partners, LLP shows a view of the horizontal framing of the Eisenhower Memorial looking toward the Capitol.Image. Architect Frank Gehry is revising the design for a memorial honoring President Dwight D. Eisenhower near the National Mall after objections have delayed the project. On Thursday, Gehry's team will propose eliminating metal tapestries on the sides of the memorial square, along with some columns. The designers are trying to win approval from the National Capital Planning Commission. The federal panel voted to reject a previous design in April. (AP Photo/ Architect Frank Gehry is revising the design for a memorial honoring President Dwight D. Eisenhower near the National Mall after objections have delayed the project. (AP Photo/Gehry Partners, LLP)
Nedko Georgieb visiting with a group from Bulgaria, right, stops to fill up his water bottles near the Washington Monument on the National Mall as temperatures reach into the mid 90s, Washington, D.C., Tuesday, September 2, 2014. (Andrew Harnik/The Washington Times)
Nedko Georgieb visiting with a group from Bulgaria, right, runs water over his face near the Washington Monument on the National Mall as temperatures reach into the mid 90s, Washington, D.C., Tuesday, September 2, 2014. (Andrew Harnik/The Washington Times)
Usha Dokania, left, and her daughter Ritika Dokania of Falls Church, Va., stop to drink water on a very hot first day of fall on the National Mall, Washington, D.C., Tuesday, September 2, 2014. (Andrew Harnik/The Washington Times)