A girl carries a U.S. flag as she takes part in a parade during Fourth of July Independence Day celebrations in Washington, D.C., U.S., July 4, 2019. REUTERS/Carlos Barria TPX IMAGES OF THE DAY

People watch the Macy's 4th of July Firework Show over the Brooklyn Bridge in New York, U.S., July 4, 2019. REUTERS/Eduardo Munoz

U.S. President Donald Trump and first lady Melania Trump arrive for the "Salute to America" event during Fourth of July Independence Day celebrations at the Lincoln Memorial in Washington, D.C., U.S., July 4, 2019. REUTERS/Carlos Barria TPX IMAGES OF THE DAY

Joey Chestnut reacts after wining the Nathan's Famous Fourth of July International Hot Dog-Eating Contest at Coney Island in Brooklyn, New York, U.S., July 4, 2019. REUTERS/Eduardo Munoz TPX IMAGES OF THE DAY

Fireworks are seen over the Lincoln Memorial during Fourth of July Independence Day celebrations in Washington, D.C., U.S., July 4, 2019. REUTERS/Joshua Roberts TPX IMAGES OF THE DAY

Demonstrators burn a U.S. flag in front of the White House during a Fourth of July Independence Day protest in Washington, D.C., U.S., July 4, 2019. REUTERS/Eric Thayer TPX IMAGES OF THE DAY

A man and a girl ride in an antique Ford automobile during the annual Fourth of July parade in Barnstable Village on Cape Cod, Massachusetts, U.S., July 4, 2019. REUTERS/Mike Segar TPX IMAGES OF THE DAY

Dancers perform on Constitution Ave during National Independence Day Parade in Washington, U.S., July 4, 2019. REUTERS/Go Nakamura TPX IMAGES OF THE DAY

Blake Berry, 7, and Kyson Harvey, 5, play on a Slip-n-slide in Norwalk, Iowa, U.S., July 4, 2019. REUTERS/Scott Morgan

Women in roller derby outfits skate by with national flags during Fourth of July Independence Day celebrations in Washington, D.C., U.S., July 4, 2019. REUTERS/Tom Brenner

Fireworks illuminate the sky over the Lincoln Memorial during celebrations of the United States' Fourth of July Independence Day in Washington, D.C., U.S., July 4, 2019. REUTERS/Eric Thayer

A man on a motorized toilet drives past spectators during a Fourth of July Parade in Norwalk, Iowa, U.S., July 4, 2019. REUTERS/Scott Morgan

U.S. Navy Blue Angels perform a flypast at the "Salute to America" event during Fourth of July Independence Day celebrations at the Lincoln Memorial in Washington, D.C., U.S., July 4, 2019. REUTERS/Carlos Barria TPX IMAGES OF THE DAY

People hold banners in support of U.S. President Donald Trump during Fourth of July Independence Day celebrations in Washington, D.C., U.S., July 4, 2019. REUTERS/Joshua Roberts

REFILE - CORRECTING IDENTITY OF PLANES A U.S. Air Force flypast of a B-2 stealth bomber and F-22 Raptor fighters is seen during President Donald Trump’s “Salute to America” Fourth of July Independence Day celebration in Washington, U.S., July 4, 2019. REUTERS/Tom Brenner

Aiden Butler and Micah Luethje shop for fireworks at a roadside stand in Indianola, Iowa, U.S., July 4, 2019. REUTERS/Scott Morgan

Hadley Bellcock, 4, and Paisley McLaughlin, 4, watch marchers during the Fourth of July Parade in Norwalk, Iowa, U.S., July 4, 2019. REUTERS/Scott Morgan

A line of Corvettes pass in the Fourth of July Parade in Norwalk, Iowa, U.S., July 4, 2019. REUTERS/Scott Morgan

Miki Sudo competes in Nathan's Famous Fourth of July International Hot Dog-Eating Contest at Coney Island in Brooklyn, New York City, U.S., July 4, 2019. REUTERS/Eduardo Munoz

Miki Sudo celebrates after winning the Nathan's Famous Fourth of July International Hot Dog-Eating Contest at Coney Island in Brooklyn, New York City, U.S., July 4, 2019. REUTERS/Eduardo Munoz

The U.S. Marine Corps Silent Drill Platoon takes part in Independence Day celebrations at the Lincoln Memorial in Washington, D.C., U.S., July 4, 2019. REUTERS/Tom Brenner

People gather at Lincoln Memorial Reflecting Pool during Fourth of July Independence Day celebrations in Washington, D.C., U.S., July 4, 2019. REUTERS/Joshua Roberts

A crowd watches Independence Day celebrations in Washington, D.C., U.S., July 4, 2019. REUTERS/Eric Thayer

A large balloon of Uncle Sam is seen on Constitution Ave during National Independence Day Parade in Washington, U.S., July 4, 2019. REUTERS/Go Nakamura

People gather around the "Baby Trump" balloon during Independence Day celebrations in Washington, D.C., U.S., July 4, 2019. REUTERS/Carlos Barria

REFILE - ADDING ID Miss Maryland, Mariela Pepin, wearing her sash and tiara, rides in an open-top vehicle during Fourth of July Independence Day celebrations in Washington, D.C., U.S., July 4, 2019. REUTERS/Eric Thayer

93-year-old Mabel Wittenmeyer waves a U.S. flag as she rides in a car during the annual 4th of July parade in Barnstable Village on Cape Cod, Massachusetts, U.S., July 4, 2019. REUTERS/Mike Segar

Women hold parasols as they take part in the Independence Day celebrations in Washington, D.C., U.S., July 4, 2019. REUTERS/Eric Thayer

Men dance next to the Sikhs of America float during Fourth of July Independence Day celebrations in Washington, D.C., U.S., July 4, 2019. REUTERS/Eric Thayer

The Berry family members, Isabel, Don, Cecil and Roger watch as a Fourth of July parade passes in Norwalk, Iowa, U.S., July 4, 2019. REUTERS/Scott Morgan

Participants dressed in historical uniforms attend Independence Day celebrations in Washington, D.C., U.S., July 4, 2019. REUTERS/Eric Thayer

A statue depicting U.S. President Donald Trump is unveiled near the Washington Monument during Fourth of July Independence Day celebrations in Washington, D.C., U.S., July 4, 2019. REUTERS/Carlos Barria