
Trump is billing his production on Washington's monument-lined National Mall as a tribute to the American armed forces, featuring fighter jet flyovers, military music, an extended fireworks display and a presidential speech.
"Our July 4th Salute to America at the Lincoln Memorial is looking to be really big. It will be the show of a lifetime!" the US president wrote on Twitter.

But America's divisive politics threatened to overshadow what has traditionally been a non-partisan national holiday.
Republican political groups confirmed that they had been given prime tickets for Trump's speech, while protest groups planned to mock the president.
Democratic lawmakers have accused the former reality-TV show host of wasting taxpayer money to stage a "campaign rally" ahead of his 2020 re-election bid, while some commentators have raised concerns about politicising the military.

The White House says the president will focus his remarks on "patriotism, not politics".
Trump's speech will be a departure from tradition. For decades, presidents have kept a low profile during the parade, concert and fireworks that have drawn hundreds of thousands of people to celebrate the anniversary of the nation's founders declaring independence from Britain in 1776.

On Wednesday, National Park Service employees closed the Lincoln Memorial to tourists as they set up metal barricades and laid out plywood before the heavy military vehicles were driven into place.
Video screens and a red-carpeted stage were already set up. Scattered thunderstorms were forecast for Thursday afternoon and evening.
"I think it's good that he's going to speak and get people excited about the Fourth again," said Jacob Mishalanie, 20, visiting from Decatur, Alabama.
Alex Matuszak, 21, who was visiting from suburban Chicago, called the event a "political scam."

Two M2 Bradley Armored Fighting Vehicles, shipped by rail from Fort Stewart, Georgia, were parked across the street, guarded by military personnel in camouflage uniforms.
M1 Abrams tanks also were due to be displayed, though they were not yet in place.

The Defense Department also arranged for flyovers by the US Navy Blue Angels squadron, a B-2 stealth bomber, F-35 and F-22 fighter jets, a V-22 tilt-rotor aircraft and the Marine One helicopters and Air Force One jet used to transport the president. The Pentagon said top military leaders will attend.